What blowback-operated semi-automatic pistols have a similar design to Astra A-60?
Astra A-60:  The design is similar to the Walther PP and features a slide-lock release lever. Walther PP: The Walther PP ("Polizeipistole", or police pistol) series pistols are blowback-operated semi-automatic pistols, developed by the German arms manufacturer Walther.
Walther PP