Weimar-era guns are facinating to me because of their rich variety and history. That was a very wild time in German history. As far as the re-worked W.W. I pistols from that era, there are hundreds of exceptions for almost every rule that anyone might try to state. Re-works were done by a variety of contractors, Simpson and Krieghoff immediately spring to mind, but they were also done by a variety of lesser known firms. The real pity is that due to the distruction from W.W.II, almost no records of these rework contracts exists.
A fascinating period that produced Lugers with "personality".
As far as the 1920 on your gun, it is probably a property mark as you suspect.
Tom A.
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