The Rolex reference 6075 is often refereed to as the "Ovettone" or "big egg" due to its pronounced back. It was one of the first of the "Datejust" line of watches made by Rolex in the first part of the 1950s. It is equipped with the ‘Super Oyster’ winding crown, a mechanism developed by Rolex in an attempt to create a non-screw down waterproof crown. This type of crown was phased out after around three years of production.