The Singer genuine 401, 403, 500, and 503 sewing machines utilize the Simanco 174529 straight stitch needle plate, which I classified as new old stock in beautiful unused condition. Style A.

The Singer genuine 401, 403, 500, and 503 sewing machines are compatible with the Simanco 174529 straight stitch needle plate, categorized as new old stock in excellent, unused condition. It exhibits minimal scratches resulting from contact during storage, which I have since addressed by securely bagging the items separately to prevent further abrasion.