Chuck, from what I can see in your photo, the mark on the right side of the barrel consisting of PTV over an eagle is the proof stamp of the Berlin Police Armory which was a branch of the Polizeischule für Technik und Verkehr. These are not independent stamps but were used together. This proof was used to indicate rework by the Berlin armory from about 1928 to 1935. In 1935, the PTV was renamed Technische Polizeischule and the proof stamp was changed to TP over an eagle. The attachment shows both proofs. Over time, there were minor variations in this mark.
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