The Rolex “Turn-O-Graph” model, has in recent times achieved cult status in the Rolex collectors community. Also known as the “Thunderbird”, Rolex introduced the name for the U.S. market in the late 1950s when it began supplying the model to the U.S. Air Force’s Thunderbird aerobatic squadron. The reference 6309 – the present lot – was the second-generation Turn-O-Graph model introduced in 1954 with an upgraded movement and produced through 1959.

Fitted with a graduated, rotating bezel, the Turn-O-Graph was designed to measure elapsed time similar to a chronograph, without the cost of a complicated chronograph caliber. It was a revolutionary design that was quickly adopted by many brands after Rolex’s introduction. The Turn-O-Graph was essentially a Datejust model, modified to become a tool watch by the addition of the rotating bezel. The larger bezel shrunk the visible surface area of the dial, causing the original “Swiss” of the Datejust dials used to nearly disappear. On this very early example, Rolex therefore printed a second “Swiss Made” at 6 o’clock to ensure this important designation was clearly visible. The present yellow gold watch with yellow gold bracelet was at its time of production, one of the most expensive and exclusive watches produced by Rolex. The 3.54 stamped on the bracelet clasp is absolutely consistent with the case number, and when combined with its excellent overall condition, it is a superb example of a very early Datejust Turn-O-Graph model for the connoisseur.