"copy of a Walther PPK"
Public Domainwaltherillustrator - Credit: atrilogy

The Walther PPK pistol was introduced in 1931.  Walther handguns were widely used by the police and military in Hitler’s Germany. 

The Walther PPK was James Bond's preferred gun in the later books and films. It is smaller than the PP, and more concealable, making it suitable for undercover work.