I think that the path to knowing what the "H.P." means will found by discovery of who captured these pistols. Names and units of the G.I.s or capture papers will shed more light on their German origin than anything else.
In Don's posting above it appears that both H.P.487 and H.P.503 were captured along with numbered holsters and mags in Bingen am Rhein. I believe that Bingen a/R was a part of Hesse prior to 1945. That being the case the marking may well indicate Hessian Police.
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