Singer Frosted Bayonet Bulb15 Watt
Singer 99K, 201, 237, 328, 401, 630, 717, 935, 1200, 2000, 2210, 4011, 4552, 4610, 4617, 4622, 4623, 4830, 4832, 6136, 6212, 6233, 6267, 6268, 6704, 6705, 7000, 7004, 7005, 7028, 7050, 9005, 9008, 9010, 9134, also Pfaff serger 4762, round double contacts