May be, in Finland, this is/was a common rifle, but I had never seen one her in town.
It is a Mosin Nagant, made or converted at Sako Riihimäki, 1943
Expect of a few dents in the stock it looks like new....
The cartridge is a 9,3x54R, the russian military cartridge 7,42x53R, opend up to 9,3 mm.
