8/7/18 - This is an original, 1941 production WW2 MP.40 magazine. The magazine is the early, more scarce "slab side" style. One side is M.P. 38u.40 maker stamped. The spine is waffen proofed with eagle/37 stamps and "fxo" maker stamped with a '41 date. The spring is strong and fully functional. The bluing is mostly excellent, but there are a few spots of rust on the sides, mostly just pinpricking. Guaranteed original.