Yacht-Master Origins and History

My pal and fellow Rolex fanatic from Italy, John Goldberger recently sent in these stunning photos of his Ultra-Rare 39.5mm Rolex Yacht-Master Chronograph Prototype [Reference 6239/6242] the dial of which was made in 1967 and the watch in 1969. How rare you ask? It is one of only two known examples. I know Eric Clapton owned one — via Jake’s Rolex World