Re: J.P Sauer & Sohn, suhl
darthawk, Cal 6.35 means the gun is chambered for what we in the US call 25 ACP or 25 Auto. Sauer made several pistols for that cartridge. The most common is a scaled down version of their Model 1913 32 caliber automatic, but they made at least 2 other "vest pocket" size 25s. These latter two look very similar, so pictures are your best bet to get some useful information. HTH!