Singer bobbin case which is compatible on various Singer Heavy Duty sewing machines.
Compatible models:
Singer: 3223, 3229, 3321, 3323 Talent, 4411, 4423 Heavy Duty, 4432, 4452, 5511, 5523, 5532 Heavy Duty, 5554, 7640 Confidence, 9100, 9340, H74, HD660, HD6600, HD6605, HD6800C