Genuine Singer machine part. For Singer 101 sewing machines. Complete rotary hook bobbin case #66572 with parts: Bobbin case tension regulating screw #591F, Bobbin case tension spring screw #1173D, Finger hinge screw #50461C, Finger spring screw #50462C, Rotating Hook Bobbin Case #66572, Bobbin Case Finger #66574, Finger Spring #66575, Tension Spring #66577. Bit dirty but working vintage Singer part. Price includes shipping.  Works or return for refund.