These Pilot side master cylinders are from 1965 A23, N1403 serial# M-792. Bought it for the overhauled IO-346 Continental. It had 1,300 TTAF, but had been sitting since 2004 and the wings were corroded and these are remaining parts that I didn’t need. Photo is attached. Priced about half of what aircraft salvage companies list. Price as listed OBO. Buyer pays shipping.