The barrel question was essentially answered by Dwight, at some point it received a finnish barrel, unsure when or why, but must have been in their arsenal or a barrel added by them. WHAT does your serial number look like and under the barrel???? When you look over the rest of this forum for 1913 DWM's how does the underside of your barrel appear compared to them? Any military markings? i.e. 8,83, its serial number etc??
The proofmarks on the right are normal acceptance and proofing by DWM.
The last picture is a good one, took me a minute to figure out cuz it is so close, but your 1913 originally did not come with a hold open (someone correct me if I am wrong), and in 1916, it was decided that hold opens were required. That is the arsenal acceptance marking that the hold open was added.
Ed
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