Mike, The 1920 on your pistol may infact be a production date. Due to the incomplete inspector's and missing proof markings and the small Weimar eagle on the right receiver, these were probably unused parts made in 1918, but not assembled until 1920 (usually marked 1918/20 on the topo of the receiver) by Simson. I'd have to see more detail on all of the inspector's marking to be sure. TH
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