They are mysterious. I talked to the guy today, whom i bought them from. He said he aquired them used in 1972. He had no idea where they came from. First i though they where norwegian army issue, but they dont look alike at all. and that stamp is not norwegian. After browsing alot of Pics of mauser clips, i cant find one exaple that does`t have those 2 holes in them, exept for turkish ones, but they are copper i think, and different spring. Might they have come from a ammo factory and the stamp is the logo of the company?