From about 1060100 to about 1082000, the “P” proof was applied toward the edge of the slide where the radius meets the flat. This was said to be due to a poorly drawn ordnance drawing showing the placement of the proof. From about 1082000 to the end of production, the “P” was placed in its normal location on the top of the slide
Most pistols in that range had the hanging "P", but honestly, they were all over the place in some cases. I've even observed them on the right side of the rear sight. The key thing is the "P" proofs on the slide and receiver have to match exactly...struck by the same stamp. Be careful. There are a lot of mismatched guns humped up to boost value.
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