Vintage Singer 15-90 bobbin winder assembly. Please note that the return spring will be too short for use on a 15-91 (potted motor), it is compatible with the 15-90 and other belt driven models 15s that use the #125324 belt guard such as the 15-88. Mounting screws and springs included. Nice, clean vintage condition with typical signs of age. Bobbin winder tire has been replaced. Original, genuine Simanco part #125327