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Check if they have a "B" on the barrel that means probably barrels from Belgium thus the plum color. I have a FIMM M 39 like that.

Check in http://www.762.54r.net

Recently purchased a FINN 28/76 and found some numbers on the bottom of the barrel, seems like a date but not quite. Not much info out there on these rifles, hope someone knows. Have also included...