Lot of two vintage Singer class 66 one hole sewing machine bobbins. These bobbins have the hard to find blackside finish, this black oxide finish was used during WW2 instead of chromium and nickel which were required for the war effort. Will fit machines that use class 66 bobbins including the 66, 99, 101, 185, 192, 201, 328, 401, 403, 411, etc. Nice vintage condition with finish intact, clean and thread free. Original Simanco part #32522