Military 45 ACP's U.S.&S

[Scott Gahimer]

They didn't all hang from te left side, either. I've seen several with the "P" proof right of center.

For the OP pistol, I'd be inspecting the "P" on both the slide and receiver. If they match, it doesn't matter where the "P" proof is located on the slide...just as long as it's there.