A Diana/RWS variant, for those wondering.

A q.

The date on mine is either '57 or '67

Due to the fact that the lettering is so small, it could be either. Wonder if any could shed a light on the probabilities. The rearsight has a plastic base and leaf, for some reason I seem to imagine that '57 is too far back, yet the truth is that the "5" or "6" has a square "back" i.e. looks more like a 5.

Otherwise looks like any similar Diana.