Could that be a barrel selector above the trigger?

Given the knot in the wood and the limited engraving, it's more than likely a GDR produced gun. Anyone else think so? Especially, if it's merely marked "Suhl" -kind of like a Fortuna or Thalmann. The frame is a much fancier design than the later 80s models, so this is probably an earlier produced gun. 50's? I'm just speculating...