Hello and Glad to be Here!
Found a M1 (SA) at a swap meet - SA# 6086*30
But in researching Spingfield Armory the last production SA was 6084145.
I have lurked and read (felt reasonably informed) and well liked what I saw and she came home with me!
I am about to disassemble and note rest of the numbers found etc...
Kind of a SN# mystery?