This is the 5 round .22LR & .17HM2 magazine for the Weihrauch HW66, HW66J and HW60 series of rifles.
Weihrauch magazines are crafted from high quality blued steel to match the finish of the rifle.
Also fits late production Krico 301 Luxus rifles manufactured for Krico by Weihrauch, note the baseplate design.