Vintage Yamaha Front Brake Master Cylinder Lever ASCO OEM 1970s 1980s UJM

Vintage Yamaha front brake master cylinder with lever. Casting marked ASCO, consistent with late 1970s–early 1980s Yamaha OEM production. Large bore reservoir, approximately 2" diameter. Lever pivots freely. Exact model fitment unknown — sold as-is for parts or restoration. Surface corrosion, grime, and wear consistent with age. No reservoir cap included. Buyer is responsible for verifying fitment before purchasing. All sales final, no returns accepted. Please review all photos carefully as they are part of the description.