Ball's book should have what you are looking for.
765 millimeters = 30.1181102 inches Direct Conversion Formula 765 mm* 1 in 25.4 mm = 30.11811024 in
20-200 USD or so
30.12" Direct Conversion Formula 765 mm* 1 in 25.4 mm = 30.12 in
Impossible to answer without a DETAILED description of ALL markings, barrel length, sights, caliber, accessories, box, papers, etc..
Yes- but the common name is 8mm Mauser.
Several German pistols used the 7.65mm cartridge. The Walther PP & PPK, the Mauser Hsc are just a couple of them.
Depends on the country of origin.
100-400 USD
$300.00-500.00 usd
No published data
probably 7mm or 8 mm
Requires professional appraisal