Here is my second M1 ww2 helmet. It is a McCord 741C which I date to about December 43. The helmet has S.9713 written into the rear inside and unknown what this means. The liner is a Firestone which I date to about early 43 to mid 44. The liner has been repainted a dark green unknown if this a period paint job I'm sure someone will let me know. You can still see the original paint job from chips in the paint. Thanks for looking.