100-1000 and up depending on specifics
Several German pistols used the 7.65mm cartridge. The Walther PP & PPK, the Mauser Hsc are just a couple of them.
Depending on EXACTLY what you have, a few hundred to multiple thousands of USD.
Depends on when it was made.
Impossible to answer without a DETAILED description of ALL markings, barrel length, sights, caliber, accessories, box, papers, etc..
Model 765 was in production from 1948 - '52.
.32 caliber
Possible.
Its positional place value is 700 = seven hundred
The square of 765 equals 585225. The cosine of 585225 equals -0.70710678118707 for your answer. Hope I helped!
$175 if in good condition
50-100 or so
50-100