Here are the ones I have:

AN5740
MFR'S PART NO.4992B
SERIAL NO. AF-42-12886
CONTRACT NO.W535ac-28072
HAMILTON WATCH CO.
Movement SER NO.4C24297
Marked U.S. GOVT on movement.

NAVIGATION MASTER WATCH
MFR'S PART NO.3992B
SERIAL NO.1646-1942
HAMILTON WATCH CO.
H.S.3
Movement ser. NO.3C1460
Marked U.S. GOVT. on movement.

Here is mine serial no.4C22996.

Here are my three to add to your Database and happy viewing. Hubert Hamilton 499 2B

Nice watches Hubert and nice presentation....

It's good to have you on board with us....

Regards,
Jerry

This is a watch I recently purchased and wanted to add this to the list.
Serial number: 4C584

Please notice the writing on the back is like on the back of the 2974B.

Here's a picture of the 4C554

Aloha Hubert
Could you tell us if ADJ TEMP. AND 6 POS.is under the center seconds bridge? and give us the serial # and contract #

Mahalo Scott

Aloha
Now lets see if this works from Jones-Horan auction a 2974B

PART NO. AN 5740
MFR:S PART NO. 4992B
SERIAL NO. 765-41
CONTRACT NO. 86366
HAMILTON WATCH CO.
ADJ TEMP. 6 POS. (UNDER THE CENTER SECOND BRIDGE)
BU. AERO. U.S.NAVY
SERIAL NO. 4C554

HI, GO TO THE JUNE 28TH POST. PITCURE SHOWES MOVEMENT,NEXT POST SHOWS BACK.LETTERING ON BACK IS DOUBLED.CASE IS KEYSTONE,BASE METAL,SER.I3OO916 THE 916 IS SMALLER.I CAN SEE THE DATSBASE WILL BE A BIG HELP.THANKS HUB.

PART NO. AN5740-1
Stock NO. 6645-663-7694
MFR'S PART NO. 33106
CONTRACT NUMBER
DA-39-038-ORD-20782(M)
SERIAL NO. AF-59-15146
HAMILTON WATCH
COMPANY

DIAL 24 HOUR G.C.T. BLACK
White hour, minute and second hand
Inside back STAR WATCH CASE CO.
BASE METAL
R998352
Movement Serial # C127975
HAMILTON WATCH CO.
U.S.A.
NO U.S. GOVT markings on movement
4992B
22 JEWELS
ADJ TEMP
AND 6
POSITIONS
Have original mohgany box w HAMILTON U.S.A. LANCASTER PA brass tag
Pics Available

WAYNE,PLEASE SHOW PITCURE OF MOVEMENT IF AVIABLE.

Posted below are 3 pictures of my 4992B from which you can glean the information you desire.

Picture 2.

Picture 3.

Scott,Check this out,HAMILTON 3992B NAVIGATION MASTER WW2 MILITARY WATCH 220595297790 it might intrest you.Listing has ended.

Scott,

What's your opinion of this picture?

Hello again Scott,
This is the case back off of serial number 3C2243. Sorry I can't send a photo of the movement, I can't figure out how to reduce the size of the photo. This serial number should be close to the end of the run but the writing on the back doesn't match anything on your data base.
What's your opinion?
Thanks,

MS28076, dated 15 Mar 57, superseded AN5740. The MS was canceled 24 Mar 1980. Same spec, different numbers. A lot of AN specs were superseded by MS specs.

One more for your list:
Movement:
Hamilton Watch Co.
4992B 22 Jewels
US. GOV.
Adj. Temp and 6 Positions
4C14938

Rear exterior case:
AN 5740
MFR'S PART NO. 4992B
SERIAL NO. AF 43-80
ORDER 43-9969-AF
HAMILTON WATCH CO.

Interior rear case lid:
KEYSTONE CASE
Base Metal
571549
(case lid and case bezel thread)

Rear case:

At what point did Hamilton remove "US. GOV." from the movements. Is there a certain serial serial or an estimated number to when they stopped stamping it?