Finnish M39 Mosin-Nagant (7.62x54), receiver dated 1905. Made in Ivshevsk (sp?). Might have already been in Finland when the Finns broke away in 1918, since it still has the old Czarist two-headed eagle proof mark. (I think, but am not sure, that most czarist-era weapons in Russia were restamped with Soviet markings later.)
Rebarreled in 1942 at the VKT arsenal in Finland, and looks like it saw lots of action afterward (stock really beat up). Bore looks brand-new, though--whoever it was issued to took very good care of it. (I suspect he was the one that carved "E. T." in the rear sight base; I wish I knew his full name.)
Still shoots into 1 3/8" at 100 yards with Wolf 148-gr FMJ.