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Its the size of the bullet that the gun is made for. its the caliber that a handgun uses
FIE.
A 22 LR caliber pistol made by Walther, it is similar in design to the Walther P99.
S&w
Titan brand .25 caliber handguns were made by Tanfoglio, an Italian gunmaker. They use proprietary magazines. Some other .25 caliber magazines from similar handguns may fit, but there is no recognized interchange and no guarantee that a mag that fits will feed correctly. Your best bet is to look for a Titan/Tanfoglio mag at a gun show or a used gun parts dealer like Numrich.
The ONLY .35 caliber pistol I have seen was the Smith & Wesson .35 Automatic. This is a rare gun, and was only made 1913-1921. Sure you don't mean a .25 caliber pistol?
Impossible to answer without knowing who made it and what the caliber is.
No sn data available.
Yes, they made many of them.
Tanfoglio of Italy.
No such weapon made by Walther.
Around 1931