Guns made in the surviving occupied Simson works immediately after WWII were made to high standards. A few examples have come to auction were made for prominent generals and politicians.
Once the Soviets consolidated all Suhl shotgun manufacturing, the historic brands of Sauer, Simson and Merkel all came from the same factory lines, with higher levels of decoration on premium guns.
I find that guns made in the Ernst Thalmann Werk, even those bearing the Quality 1 stamp, are just not up to their earlier reputation for fit and finish.
I briefly owned a late manufacture GECO branded Quality 1 gun in 20 gauge from the Thalmann Werk, still stiff with newness, that I just could not work up any affection for. And so, it went down the road.