M1 carbine type one firing pin

[Gary D. Funderburg]

I dissembled a Standard Products bolt today and found a type one firing pin marked WN with an S below. Riesch's book does not show that marking for Standard Products. Nor does anyone else. Any thoughts?
Thanks in advance for comments.

[Tuna]

WN is for Worcester Tapper Pin Co. Made for National Postal meter. Used through early 1943. I don't find any information of any firing pins going to Standard Products from National Postal Meter. But that doesn't mean it didn't happen. Is this in a carbine that seems to be all original?

[Sunray]

Hundreds of small shops all over the Eastern Seaboard made parts for Carbines. None of the primary manufacturers made all the parts anyway. Standard Products, for example, only made 4 of the 60 some(I think it's 60ish) parts. They made receivers but no barrels.
That's why "all original" is a misnomer. There's no such thing.

[Tuna]

Gary, Is the S directly below the WN?

[Gary D. Funderburg]

Appears to be un molested import that bolt came out of. "S" is below the WN.

[Gary D. Funderburg]

Thanks for the answers.

[Tuna]

I will take a wag here and say that it might have been some pins made for National Postal meter that were instead shipped to Standard Product on a need basis. Standard then stamped the S on them to show who had used them in the end.