McChord and Schuleter produced so many that they lasted for years after.
Printable View
If it is an "I" stamp preceding the number then chances are it is an Ingersoll produced helmet from the 1960s.
BEAR
Attachment 93244
It is definitely a postwar helmet. Vietnam era.
That's why we got all those WW2 era helmets from the US, you guys were producing the new ones for RVN effort. We used most of ours up completely. Then we bought new ones...from you. Ingersol...forgot about them.