Firing Pin Makers/Prime Contractors?

[INLAND44]

I have two spare FPs - one is original blue and marked 'HS' which I guess is 'High Standard', but it also could be 'H' for Saginaw or something, I suppose. The other is Parkerized (probably during a rebuild) and is marked 'DN'. 'D' for NPM?

Information

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[JimF4M1s (Deceased)]

From War Baby

HS was Hunter Arms Co. in Fulton, N.Y. for Standard Products.

DN show for NPM but no name or location

[INLAND44]

Thanks much!