I will soon have a HUGE dump of information on USMC registration numbers.
A very interesting bit of information s that the USMC registration number were not all sequential. Meaning that an M151A1 could have a lower Registration number than an M151A2
946 - M151A2s - received - 27th October 1970 - USMC #s 385500 to 386445
1 - M151A1 - received - 6th June 1971 - USMC # 386446
1 - M151A1 - received - 11th January 1971 - USMC # 386454
M151A1 & M151A2
Long front bumper with lifting shackles to aid in helicopter transport & ship loading.
M151A1
Rear corner supports with lifting shackles to aid in helicopter & ship loading.
M151A1 & M151A2
A gear shift lock that was bolted to the tunnel cover with an arm that would swing up around the gear shift lever. Then a pad lock was installed.
M151A1 & M151A2
Flat plate bolted to the lip, where the fuel tank opening is. This 1" wide plate was bolted loosely on one side and a padlock installed on the other.
The last 3 digits, or the whole registration number were sometimes painted on the seat cushion backs & gas cans.
Also unit markings were painted like the picture below "2134". This later (early 1990s) changed to this format "M13216" This indicated a specific USMC unit.
All M151A1s are 300000 series registration numbers
All M151A2s are 300000 or 50000 registration numbers
M416B1 - In picture below. Brackets ahead of fenders for mounting fuel cans. Also lifting loops on front and back.
M416 - All USMC trailers have the lifting loops like the picture below, but are thicker than the B1 and do not have the gas can mounts.
M151A1 & M151A2
Base new vehicle has twist knobs installed on grill for grill cover.
M151A1 & M151A2
Base new vehicle has fording cable and related engine components installed. Fording tubes and brackets are not installed.
M151A1 & M151A2
Base new vehicle has outline for camouflage pattern painting. Paint in the lines, just like a coloring book.
There were at least 4 different variations of the USMC FAV. See link below for page dedicated to the specially modified jeeps.