2/28/18 - This is an original WW1 era production snail drum artillery Luger magazine. The magazine is "B/N" maker stamped and serial numbered 316309. The finish is all original but there is patina and thinning of the blued finish throughout. The spring is strong and fully functional though, and the magazine winds smoothly with no issues. Guaranteed original and authentic. Also fits 9mm WW1 & WW2 era German submachine guns.