Steve, it sounds very much like a post-war "1920" commercial rework of a 1914 Erfurt Artillery. From your description of the non-adjustable front sight, it's my guess that the barrel/receiver is either a late war (1917 or 1918) DWM that has had the proofs and date scrubbed OR possibly a new war surplus (left over parts) barrel/receiver with Erfurt parts (toggle train, frame). There are other possibilities but those are the most likely.
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