Hi, the Quality stamps are normally found on one of the bbl lugs.

Here's a quick run down on the Quality Marks found on DDR Guns:

Q1 (since the early 60s) and S (until 1960) = superior quality over the average level of the world market
1 = good quality on the average level of the world market
2 = sufficient quality; adequate but below world market level

These marks are found only on DDR (East German) guns. Guns that are pre-war or West German won't have these marks.

Best of luck to you!

Greg

Gregory J. Westberg
MSG, USA
Ret