Mark, The 3 ground down proofs on the LEFT receiver, would indicate to me that it once was a first issue (1908 or 9) DWM military. The 16b serial would place it in 1909, and the matching frame, if original, should be without stock lug. The Imperial accepted (Crown over a letter) sear and hold open, would suggest Erfurt production. The 2 digits ON the receiver lug, are serials during this period, not inspector marks. Sounds like a "Frankenluger" shooter to me, particularly the white Franzite (should be marked inside) bottom on the mag. TH
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