twin serial number M1s

[mac1911]

http://cmpauction.thecmp.org/detail.asp?id=2503&n=M1-SA--WRA-Matching-Serial-s-1362555

 

[PeacefulMuslim]

I am not well versed on serial numbers. Would this have happened because of an overlap in production by different manufacturers, or is this normal and the weapon reverts to the manufacturer?

 

[dhuze]

When the DOD assigned serial number blocks they overlapped some between manufactures.