LAYSHAFT, BSA M SERIES, 1938-48, GENUINE BSA NEW OLD STOCK
Part Number 24-4394
In the original packaging, coated in black cosmoline, and wrapped in waxy preservative paper. Now there’s NOS for you. And who was D.C. & P.M...
(Cosmoline is the genericized trademark for a common class of brown wax-like petroleum-based rust inhibitors, typically conforming to United States Military Standard)