Can anyone give me any information on what I believe this to be a WWI era German signal or line throwing gun? Barrel and frame are Crown U proofed and there are no other markings. This is a WWII battlefield pickup / bringback. Barrel is slightly less than 3" long and bore measures 12mm. I'm now thinking that a line-throwing device may have attached to this gun due to appearance and caliber.
--Thank you.
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