Air pistol designers have often tried to emulate the real thing, even if there are only vague similarities. Look for example at the Webley Whiting. The straight grip Webleys could be mistaken in the dark for the Colt 1911, as could the earlier Benjamin pistols. Whilst only very vague, I've always thought the Akvoke looked like an Astra 600.

There are still springers made such as the Chinese S2 . Co2 like CP1 and PP700 so the interpretation of 'what should an air pistol actually look like' is still quite large