Date for a M1A1 reciever by serial #?

[p51]

I tried looking this up from my IMA torch cut set from the 90s but couldn't nail down when it was made. Its Auto Ordnance marked.

Edited June 26, 2025 by p51

[Frank I.]

I would ESTIMATE that it was made during the last months of production, due to the 800-thousand serial number. I have never documented any M1A1s with a higher s/n than the 800k-range. The last Thompsons were delivered in February 1944. (Thompson production had be extended because of problems welding M3 SMG receivers together)

Also, I would GUESS that it is an Auto-Ordnance Bridgeport mfg, not Savage, because of the late s/n range with the added A1 suffix and the serial number that is somewhat misaligned, both are indications of A-O mfg. 

American Thunder III, M1 chapter page 156

[p51]

Thank you, Frank. I have American Thunder II but couldn't find anything on it there, could have missed something similar on another page though?

[ebeeby]

I have 872409

[p51]

3 hours ago, ebeeby said:

I have 872409

I sure hope it's more complete than mine was before I turned it into a BFONG....

Here is is now, though:

[Frank I.]

On 6/27/2025 at 2:51 PM, p51 said:

Thank you, Frank. I have American Thunder II but couldn't find anything on it there, could have missed something similar on another page though?

AT3 is an upgrade over earlier editions...new info, hardback covers, and in addition more vintage B&W, many COLOR pictures.