I've checked Ruth's War Baby books and Reisch's book on M1 production and can't find an answer. Is there a production chart that ties production by serial numbers to month/year time frames?
None that I know of. However, there's yet another book with assigned S/N's called "Collecting The M1 Carbine III" by J.C. Harrison. NPM was working on your S/N range from Dec. 1943 to May 1944.
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