Vintage Singer sewing machine top hat decorative stitch disc / cam set in box. The box is marked for class 600 and 603 but they are compatible with the following models: 401 / 401A, 403 / 403A, 411G, 421G, 431G, 500 / 500A, 503 / 503A, 600, 603, 626 and 648. This is set #21976, it includes the following 12 discs: #3, 6, 7, 11, 12, 13, 14, 15, 16, 19, 20 & 21 - Please see the stitch chart for reference. All the discs are in good vintage condition, the original box will display typical wear. Genuine, original Simanco accessory.