CRS,

If it is indeed a GDR gun, "Merkel" or "Simson" labels aren't all that important and didn't seem to matter much. I've seen "Sauers" made on Merkel type SxS frames. Seems the Ernst Thalmann Werke wasn't too concerned with model-label accuracy.

Bonny, when you contact the seller ask if there is a Q1, S, 1 or 2 stamp on the lug. That will tell you for certain if it's an East German gun.