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Its the size of the bullet that the gun is made for. its the caliber that a handgun uses
No published sn data
FIE.
A 22 LR caliber pistol made by Walther, it is similar in design to the Walther P99.
S&w
It was made by Hi Standard. It's a model Double Nine (DBL9) 9 shot single or double action 22 cal western pistol.
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.
No such weapon made by Walther.