The aircraft delivered in March 1942 in India an Australia still had the orange triangle as Dutch national marking applied. As far as i know only a few publicity photos from North American, exist showing Mitchell  N5-126 with several other B-25Cs.
The triangles were very soon replaced with de Dutch flag as national marking.

The first B-25Cs had their serials applied on the leading edge and on the fuselage and also had the US fiscal year number (in yellow) on the vertical tail. In August 1942 the serial on the leading edge was removed.

May 1943 another changed was made and new B-25s had their serial in small white digits just behind the cockpit section and sometimes also (in the same format) on the tail. The serial near the flag was not applied.  The B-25s already in use had these change applied during their maintenance.

From May 1944, the registrations were larger applied both on the nose and tail in a white US stencil font on all new B-25s and, during major maintenance on all other Mitchells.
On stripped examples, especially the transport Mitchells, the serials were applied in black in stead of white.

After the capitulation of Japan and certain from September 1945 and on, all camouflaged aircraft received  a white border around the flag.

On August 25, 1947 it was decided to carry out the registrations on vertical tail surfaces into two types: type I,  250 mm in height and in type II, 460 mm. The factory letter and "the function number" was in type I (N5 for the  B25: N for North American and '5' for Bomber) and the number in type II.
Application of this system followed in the case of the B-25's by mid-October 1947 and was performed in white on a dark background and in black on a light (white metal) surface.

Late 1947-early 1948, the flag was again replaced by the Dutch roundel in six positions and a small flag on the tail.

Starting in January followed a comprehensive review of the registration system and the serials were changed to M numbers where N5 was changed to M and the serial number has been increased by 200.

 

For an extended overview of each (Dutch) B-25 I refer tot the book written by  Gerben Tornij.

 

Serial
Serial
2nd Serial
2nd Serial
Us Fisc. Year nr.
US Fis. Year nr.
RAAF Serial
RAAF Serial
Constr. nr.
Constr. nr.
Date in service
Date in service
Date out of service
Date out of service
Notes
notes
North American NA-82C B-25C
N5-132 N5-122 41-12437     02-03-1942 07-12-1942 After July 1942 N5-122
N5-134 N5-123 41-12464     12-04-1942 03-09-1942 After July 1942 N5-123
N5-136 N5-124 41-12439     12-04-1942 03-09-1942 After July 1942 N5-124
N5-151 N5-125 41-12482     12-04-1942 03-09-1942 After July 1942 N5-125
N5-161 N5-126 41-12501     12-04-1942 03-09-1942 After July 1942 N5-126
N5-146 N5-127 41-12494     30-06-1942 03-09-1942 After July 1942 N5-127
 
N5-128   41-12935   82-5570 20-08-1942 21-01-1947 "Donald Duck"
07-1943 modified to strafer;
09-1944 modified to transport aircraft; Call-sign VH-RDA, later VH-RDX
Crash during take off Biak; Written Off.
N5-129 M-329 41-12916   82-5551 24-08-1942 05-1950 09-1943 modified to strafer;
09-1944 modified to transport aircraft; Call-sign VH-RDB; later VH-RDC
09-1945 RAPWI
To AURIS
N5-130   41-12914   82-5549 23-08-1942 30-07-1945 07-1943 modified to strafer;
Crash during landing at Cressy op 30-07-1945;
14-08-1945 Scrapped
N5-131 M-331 41-12936   82-5571 25-08-1942 01-03-1948 "Pulk"; "Elza"
10-1945: RAPWI
03-1948 Written Off
N5-132   41-12919   82-5554 27-08-1942 5-2-1943 Crash during take-off McDonald, Australia, 5-2-1943
N5-134 M-334 41-12885   82-5520 31-08-1942 05-1950 09-1943 modified to transport aircraft; Call-sign VH-RDC
To AURIS
N5-135   41-12912   82-5547 02-09-1942 28-04-1943 Shot down near Dobo, Aroe islands on 28-4-1943
N5-136   41-12933   82-5568 04-09-1942 07-10-1943 Shot down near Waingpapu, Soemba on 7-10-1943
N5-138 M-338 41-12934   82-5569 08-09-1942 05-1950 07-1944: modified to transport aircraft
To AURIS
N5-139   41-12913   82-5548 09-09-1942 31-01-1943 Emergency landing in swamps near Tree Point;
14-02-1943 Written Off
N5-145   41-12798   82-5433 17-09-1942 18-10-1943 Mid 1943: "The Flying Dutchman";
05-1943: modified to strafer;
Crash during down wind landing at Batchelor; Written Off
North American NA-87D B-25D
N5-133   41-29724   87-7889 29-08-1942 02-04-1943 Emergency landing near Mellville Island. 2-4-1943
N5-137   41-29735   87-7900 06-09-1942 04-01-1944 06-1943 modified to strafer;
In 1943 "Aircab II"
Shot down near Tenau, Timor.
N5-140   42-29723   87-7888 14-09-1942 05-04-1943 Ditched in Darwin sea
N5-141   41-29725   87-7890 22-09-1942 07-11-1943 07-1943 modified to strafer;
Crash during landing on Mascot
N5-142 M-342 41-29716   87-7881 28-09-1942 05-1950 07-1943: modified to strafer;
02-1944 modified to transport aircraft; Call-sign VH-RDD;
To AURIS
N5-143   41-29722   87-7887 28-09-1942 1946 06-1943: modified to strafer;
End of 1943 modified to transport aircraft after being damaged during take off on 12-10-1943;
In 1946 Written Off
N5-144   41-29717   87-7882 28-09-1942 18-2-1943 Shot down near Dilli, Timor
North American NA-94C10 B-25C-10
N5-148 M-348 42-32338   94-12746 03-04-1943 05-1950 1945: modified to transport aircraft;
1947, to PVA;
To AURIS
N5-150   42-32337   94-12745 06-04-1943 2-06-1943 1943: "Pearl Diver":
Shot down Lautern
N5-153   42-32339   94-12747 04-05-1943 09-09-1943 "René"; Crash landing on Batchelor;
02-1944 Scrapped
North American NA-93C15 B-25C-15
N5-146 M-346 42-32512   93-12620 01-04-1943 05-1950 1943: "Lienke"
02-1944 modified to transport aircraft; 11-1945: RAPWI;
To AURIS
N5-147 _ 42-32484   93-12592 01-04-1943 21-05-1943 Shot down Saumlaki.
N5-149 M-349 42-32511   93-12619 03-04-1943 05-1950 1943: "De 2 C's" and "Sarinah";
1944: modified to transport aircraft;
10-1946 to PVA;
To AURIS.
N5-151 M-351 42-32485   93-12593 06-04-1943 05-1950 1944: modified to transport aircraft;
11-1945: RAPWI;
1947 to PVA;
To AURIS
N5-152   42-32483   93-12591 12-04-1943 22-05-1943 1943; "Tangerine";
Crash near start from Batchelor
North American NA-87D20 B-25D-20
N5-154 M-354 41-30584   87-8749 25-09-1943 05-1950 1944: "De Strietser"
1948 to PVA;
To AURIS
N5-155   41-30586   87-8751 28-09-1943 28-09-1944 Crash near landing on Bankstown; Scrapped for spare parts.
N5-156   41-30587   87-8752 24-09-1943 21-10-1943 Crash near Strauss Airstrip, Darwin
N5-157   41-30588   87-8753 23-09-1943 08-08-1944 Belly landing and on 18-9-1944 scrapped.
N5-158 M-358 41-30589   87-8754 28-09-1943 05-1950 04-1944: modified to transport aircraft;
1945: RAPWI;
07-1946: Flight with Gen. Spoor to the Netherlands;
08-1946 Flight back;
To AURIS
N5-159   41-30681   87-8747 24-09-1943 21-11-1943 Shot down Teberfane, Aroe-islands.
N5-160 M-360 41-30713   87-8878 28-09-1943 06-1950 03-1943: modified to transport aircraft;
1948: VIP aircraft Gen. Spoor;
To AURIS
N5-161   41-30816   87-8981 24-09-1943 09-01-1943 1943: "Missippi Dream";
Landing accident Drysdale River Mission
North American NA-84D10 B-25D-10
N5-169   41-30321   87-9486 31-01-1944 25-08-1944 Missed in action near Larat, Tanimbar islands.
North American NA-84D15 B-25D-15
N5-167   41-30414   87-9579 27-01-1944 19-12-1944 Damaged after explosion; 26-1-1945: Scrapped
N5-168   41-30416 A47-35 87-9581 27-01-1944 28-08-1944 Handed over to no. 2 squadron RAAF
North American NA-100D25 B-25D-25
N5-162   42-87349   100-23342 10-01-1944 23-06-1944 Shot down Saumlaki 26-6-1944
N5-163 M-363 42-87350   100-23343 11-01-1944 01-10-1948 1945: modified to transport aircraft;
12-1948 Written Off.
N5-164 M-364 42-87305   100-23298 08-04-1944 05-1950 1945: modified to transport aircraft;
1949: to PVA;
To AURIS
N5-165 M-365 42-87595   100-23588 04-02-1944 05-1950 03-1945: used as trainer;
1947 to PVA;
To AURIS
N5-166 M-366 42-87398   100-23391 27-01-1944 05-1950 1944: "Beth"
1945: modified to transport aircraft;
1949: to PVA;
To AURIS
N5-170 M-370 42-87254   100-20747 25-02-1944 1946 08-1945: used as operational trainer.
N5-171   42-87255 A47-36 100-20748 25-02-1944 28-08-1944 Handed over to no. 2 squadron RAAF 28-8-1944.
N5-172 M-372 42-87256   100-20749 10-02-1944 05-1950 1944: "Myra";
1946: modified to transport aircraft;
1948 to PVA;
To AURIS
N5-173 M-373 42-87257   100-20750 24-02-1944 05-1950 07-1945: used as operational trainer;
1949: to PVA;
To AURIS
N5-174   42-87258 A47-37 100-20751 13-02-1944 28-08-1944 Handed over to no. 2 squadron RAAF
N5-175   42-87259 A47-33 100-20752 24-02-1944 09-08-1944 Handed over to no. 2 squadron RAAF
N5-176   42-87313   100-20806 13-02-1944 30-05-1944 Crash in sea near Grose Island during training flight.
N5-177   42-87311   100-20804 10-02-1944 18-05-1944 1944: "Old Dutch Cleanser";
Shot down near Saumlaki
N5-178 M-378 42-87312   100-20805 24-02-1944 06-1950 1944: "Aileen", later "Joyce"; 03-1945: used as operational trainer; 12-1948: to PVA
To AURIS
N5-179   42-87307   100-20800 12-02-1944 06-03-1944 Shot down near Toeal, Kei islands
N5-180   42-87416   100-20814 ? 02-1944 1945 1944: "ADA";
08-1944: modified for propaganda flights.
1945: withdrawn from use.
N5-182   42-87597   100-23650 18-02-1944 29-03-1944 Crash near Swan Hill;
Written Off 31-7-1944
N5-183   42-87607 A47-1 100-23600 24-02-1944 24-04-1944 Handed over to no. 2 squadron RAAF
North American NA-100D30 B-25D-30
N5-181   43-3423 ?? A47-3 100-23649 30-03-1944 24-04-1944 Handed over to no. 2 squadron RAAF.
N5-184 M-384 43-3282   100-23608 15-02-1944 01-10-1948 Written Off 10-1948 (TB-25).
N5-185 M-385 43-3421   100-23747 10-02-1944 1945 08-1944: modified for propaganda flights.
1944: "Lienke"
Propaganda flights: 24-09-1944: Potshot-Java-Potshot; 28-01-1945: idem;
30-01-1945: Photo flight: Potshot-Java-Broome;
Na 09-1945 crash in sea.
N5-186   42-87608 A47-34 100-23601 14-02-1944 09-08-1944 1944: "Dominggoe 5";
Handed over to RAAF.
N5-187   43-3422 A47-2 100-23748 24-02-1944 27-04-1944 between 14-12-1943 and 17-01-1944: RNMFS Jackson; than ferry flight to Australia.
On 24-02-1944: as N5-187 to PEP
Handed over to RAAF.
N5-188 M-388 42-87260   100-20753 26-02-1944 16-05-1948 1944: "Blondie", later "Pistol Packing Mama"
1945: modified to transport aircraft;
Burned after emergency landing on beach near Tokyo and written off.
N5-189   43-3424 A47-4 100-23750 27-03-1944 22-04-1944 26-3-1943: RNMFS;
27-03-1944: to PEP, Canberra;
Handed over to RAAF.
N5-191   43-3425   100-23751   28-02-1944 26-11-1943: RNMFS, Jackson;
27-02-1944: Crash during ferry flight between California and Hawaii.
N5-192   43-3426 A47-5 100-23752 27-03-1944 22-04-1944 25-11-1943: RNMFS, Jackson;
02-1944: "Palembang I"
PEP, Canberra: 27-03-1944;
Handed over to RAAF.
N5-193   43-3427 A47-6 100-23753 30-03-1944 22-04-1944 26-11-1943: RNMFS, Jackson;
30-03-1944: PEP, Canberra;
Handed over to RAAF.
N5-194   43-3607 A47-7 100-23933 30-03-1944 22-04-1944 09-01-1944: RNMFS, Jackson
30-03-1944: PEP, Canberra;
Handed over to RAAF.
N5-195   43-3613 A47-8 100-23939 30-03-1944 22-04-1944 13-01-1944: RNMFS, Jackson;
30-03-1944: PEP, Canberra;
Handed over to RAAF.
North American NA-100D35 B-25D-35
N5-190   43-3830 A47-22 100-24156 29-04-1944 12-06-1944 Handed over to RAAF.
N5-196   43-3621 A47-9 100-23947 30-03-1944 22-04-1944 10-01-1944: RNMFS, Jackson;
30-03-1944: PEP, Canberra;
Handed over to RAAF.
N5-197   43-3623 A47-10 100-23949 30-03-1944 25-04-1944 10-01-1944: RNMFS, Jackson;
30-03-1944: PEP, Canberra;
Handed over to RAAF.
N5-198   43-3624 A47-11 100-23950 30-03-1944 27-04-1944 15-01-1944: RNMFS, Jackson;
02-1944: "Gatjah"
30-03-1944: PEP, Canberra;
Handed over to RAAF
N5-199   43-3225 A47-12 100-23951 30-03-1944 27-04-1944 15-01-1944: RNMFS, Jackson;
02-1944: "Toezoee"
30-03-1944: PEP, Canberra;
Handed over to RAAF
N5-200   43-3626 A47-13 100-23952 30-03-1944 27-04-1944 14-01-1944: RNMFS, Jackson;
30-03-1944: PEP, Canberra;
Handed over to RAAF.
N5-201   43-3766 A47-14 100-24092 30-03-1944 25-04-1944 03-02-1944: RNMFS, Jackson;
30-03-1944: PEP, Canberra;
Handed over to RAAF.
N5-202   43-3767 A47-15 100-24093 13-04-1944 24-04-1944 09-02-1944: RNMFS, Jackson
13-04-1944: PEP, Canberra;
Handed over to RAAF.
N5-203   43-3768 A47-16 100-24094 13-04-1944 25-04-1944 08-02-1944: RNMFS, Jackson;
02-1944: "Kalidjati"
13-04-1944: PEP, Canberra;
Handed over to RAAF.
N5-204   43-3769 A47-17 100-24095 13-04-1944 22-04-1944 09-02-1944: RNMFS, Jackson;
13-04-1944: PEP, Canberra;
Handed over to RAAF.
N5-205   43-3770 A47-18 100-24096 13-04-1944 26-04-1944 09-02-1944: RNMFS, Jackson;
13-04-1944: PEP, Canberra;
Handed over to RAAF.
N5-206   43-3790 A47-19 100-24116 14-04-1944 22-04-1944 PEP, Canberra;
Handed over to RAAF.
N5-207   43-3791 A47-20 100-24117 13-04-1944 22-04-1944 PEP, Canberra;
Handed over to RAAF.
N5-208 M-408 42-3833   100-24159 14-04-1944 05-1950 06-1945: modified to transport aircraft (?)
1948: to PVA
To AURIS.
N5-209 M-409 43-3835   100-24161 14-04-1944 14-05-1949 06-1945: modified to transport aircraft;
1948: to PVA;
To 18 squadron; Crash Kroja; Written Off.
210   43-3834   100-24160 25-04-1944 18-08-1944 Shot down Langgoer, Kei islands.
N5-211   43-3836   100-24162 10-05-1944 08-01-1945 Crash during take off at Batchelor;
Written Off op 15-1-1945
N5-212   43-3823 A47-23 100-24149 10-05-1944 09-06-1944 PEP, Canberra;
Handed over to RAAF.
N5-213   43-3789 A47-21 100-24115 29-04-1944 09-06-1944 PEP, Canberra;
Handed over to RAAF.
N5-214   43-3868 ?   100-24194 01-05-1944 01-09-1944 Shot down near Langgoer;
Written Off 1-9-1944
N5-215   43-3869 A47-25 100-24195 11-05-1944 09-06-1944 PEP, Canberra;
Handed over to RAAF.
N5-216   43-3867 A47-24 100-24193 11-05-1944 10-06-1944 PEP, Canberra;
Handed over to RAAF.
North American NA-108J1 B-25J-1
N5-218 M-418 43-27692   108-34705 22-05-1944 05-1950 1944: "Grace";
1949: modified to strafer;
To AURIS
N5-219   43-27691 A47-27 108-34704 09-06-1944 09-06-1944 PEP, Canberra;
Handed over to RAAF.
N5-220 M-420 43-27689 A47-26 108-34702 09-06-1944 09-06-1944 PEP, Canberra;
Handed over to RAAF.
N5-221 M-421 43-27688   108-34701 05-06-1944 05-1950 1944: "Japie"
1949: modified to strafer;
To AURIS.
N5-222   43-27690?   108-34703 21-06-1944 15-09-1944 Shot down near Langoer, Kei islands.
North American NA-108J5 B-25J-5
N5-217   43-27925   108-34938 19-05-1944 10-2-1945 Belly landing at Fall Field;
Scrapped.
N5-223 M-423 43-27926   108-34939 29-06-1944 05-1950 1948: modified to strafer;
To AURIS.
N5-224   43-27927 A47-28 108-34940 11-07-1944 11-07-1944 PEP, Canberra;
Handed over to RAAF.
N5-225   43-27928 A47-29 108-34941 11-07-1944 12-07-1944 PEP;
Handed over to RAAF.
N5-226 M-426 43-27929   108-34942 06-08-1944 05-1950 1949: modified to strafer
To AURIS.
North American NA-108J10 B-25J-10
N5-227   43-28181 A47-32 108-35194 31-07-1944 05-08-1944 PEP, Canberra;
Handed over to RAAF.
N5-228 M-428 43-28182   108-35195 01-08-1944 05-1950 1949: modified to strafer;
To AURIS.
N5-229   43-28185 A47-30 108-35198 27-07-1944 27-07-1944 PEP, Canberra;
Handed over to RAAF.
N5-230   43-28184   108-35197 27-07-1944 04-08-1946 Shot down near Kali-Banteng, Semarang
N5-231   43-28183 A47-31 108-35196 27-07-1944 27-07-1944 PEP, Canberra;
Handed over to RAAF.
North American NA-108J15 B-25J-15
N5-232   44-29021 A47-38 108-32296 13-07-1944 13-09-1944 PEP, Canberra;
Handed over to RAAF.
N5-233 M-433 44-29022   108-32297 15-09-1944 05-1950 1949: modified to strafer;
To AURIS
N5-234 M-434 44-29023   108-32298 19-09-1944 05-1950 1949: modified to strafer
To AURIS.
N5-235   44-29024 A47-39 108-32299 18-09-1944 18-09-1944 PEP, Canberra;
Handed over to RAAF.
N5-236   44-29029   108-32304 19-09-1944 29-03-1945 Crash at Merauke;
N5-237 M-437 44-29030   108-32305 19-09-1944 05-1950 1948: modified to strafer;
To AURIS.
N5-238   44-29031   108-32306 25-09-1944 02-07-1946 Destroyed at Pakan Baroe, Sumatra.
N5-239 M-439 44-29032   108-32307 19-09-1944 05-1950 modified to strafer;
To AURIS
N5-240 M-440 44-29033   108-32308 25-09-1945 05-1950 1948: modified to strafer;
To AURIS.
N5-241   44-29034   108-32309 21-09-1944 14-11-1944 Crash during landing at Canberra and Written Off.
North American NA-108J20 B-25J-20
N5-242 M-442 44-29260   108-32535 25-11-1944 05-1950 To AURIS.
N5-243 M-443 44-29261   108-32536 12-12-1944 05-1950 To AURIS.
N5-244 M-444 44-29262   108-32537 25-11-1944 05-1950 1945: "Snooper";
1949: modified to transport aircraft;
To AURIS.
N5-245 M-445 44-29263   108-32538 14-12-1944 17-09-1947 Emergency landing after bomb explosion at Andir.
N5-246 M-446 44-26514   108-32789 10-12-1944 05-1950 To AURIS.
N5-247 M-447 44-29515   108-32790 28-11-1944 05-1950 1949: modified to transport aircraft
To AURIS.
N5-248 M-448 44-29516   108-32791 31-12-1944 05-1950 1949: modified to transport aircraft
To AURIS.
N5-249 M-449 44-29517   108-32792 03-12-1944 05-1950 To AURIS
North American NA-108J25 B-25J-25
N5-250 M-450 44-30504   108-32779 27-03-1945 05-1950 1949: modified to transport aircraft;
To AURIS.
N5-251 M-451 44-30506   108-32781 27-03-1945 05-1950 To AURIS.
N5-252 M-452 44-30507   108-32782 27-03-1945 21-07-1947 Shot down Palembang 21-7-1947
N5-253   44-30508   108-32783 27-03-1945 9-06-1945 Burned at Archerfield; Written Off.
N5-254   44-30900   108-34175 19-04-1945 21-11-1945 Written Off after dithc in sea between Broome and Truscott.
N5-255   44-30903   108-34178 17-01-1945 4-09-1945 Crash at Malino, Celebes
N5-256 M-456 44-30505   108-34180 11-05-1945 05-1950 To AURIS.
N5-257 M-457 ? 44-30391   108-33666 23-05-1945 09-06-1947 Written Off.
N5-258 M-458 44-30399   108-33674 30-05-1945 05-1950 To AURIS.
N5-266 M-466 44-30902   34-34177 20-07-1945 1946 Written Off 1946
North American NA-108J30 B-25J-30
N5-259 M-459 44-31201   108-34476 08-06-1945 05-1950 To AURIS
N5-260 M-460 44-31202   108-34477 08-06-1945 05-1950 To AURIS.
N5-261 M-461 44-31203   108-34478 07-06-1945 22-12-1949 Ditch near Makassar.
N5-262   44-31204   108-34479 10-06-1945 1946 Written Off mid 1946
N5-263 M-463 44-31256   108-34521 12-06-1945 02-1947 11-1945: RAPWI;
1945: Personal aircraft Gen. Kengen;
Written Off.
N5-264 M-464 44-31258   108-34523 18-06-1945 05-1950 To AURIS
1970: to Militaire Luchtvaart Museum; Since 23-10-1971 on display.
N5-265 M-465 44-31259   108-34524 25-06-1945 15-04-1947 Ditch in sea near Ambon-Biak.

 

Royal Netherlands Military Flying School te Jackson

US Fisc. Year nr.
US Fisc. Year nr.
Constr. nr.
Constr. nr.
Date in service
Date in service
Date out of service
Date out of service
Notes
notes
North American B-25D-15-NC
41-30472   24-04-1943 21-02-1944  
41-30491   24-04-1943 21-02-1944  
41-30499   24-04-1943 21-02-1944  
41-30500   24-04-1943 26-01-1944 Crash near Panama City
41-30501   24-04-1943 02-03-1944  
North American B-25C-5NA
42-53394   19-11-1942 24-02-1944  
42-53395   24-01-1943 07-03-1944  
42-53395   19-11-1942 06-03-1944  
42-53397   19-11-1942 07-03-1944  
42-53398   05-11-1942 21-02-1944  
42-53407   26-11-1942 21-02-1944  
42-53490   10-12-1942 21-02-1944  
42-53491   10-12-1942 09-02-1944  
42-53492   13-12-1942 08-03-1944  
42-53493   11-12-1942 08-02-1944  
North American B-25C-25-NA
42-64781   22-05-1943 10-03-1944  
42-64782   22-05-1943 03-03-1944  
42-64783   22-05-1943 21-02-1944  
42-64784   22-05-1943 21-02-1944  
42-64785   22-05-1943 02-03-1944