Hopefully those of you better informed about IBM's can help me out.
I see both dated and NO date IBM barrels with and without the hack saw cut behind the rear sight blade.

Does anyone know why this is?

Also what would be the proper size and style P proof stamp marked on a IBM barrel used by IBM?

Would it be the Serif P about 3/32nds" tall?

I don't own all the CC back newsletters.
Does anyone know where there maybe a listing of P proof markings used by the makers?
Showing size and style?

Appreciate any help,
Charlie
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