War Baby (p. 212) indicates interchangeability testing of 6 NPM's in the 4.23M S/N range in early March 1944. All had IBM barrels (p. 446). Probably a safe assumption that these were produced in Jan...
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War Baby (p. 212) indicates interchangeability testing of 6 NPM's in the 4.23M S/N range in early March 1944. All had IBM barrels (p. 446). Probably a safe assumption that these were produced in Jan...