The Rolex Reference 6536 was launched circa 1955 and is considered to be one of the earliest Submariner references (along with the Big Crown references 6200,6538, and the small crown 6204). Produced for approximately 5 years, its movement was powered by Caliber 1030, which was also available as a Certifi ed Chronometer movement cased as Reference 6536-1. Several variations of the dial were available in the Submariner's early production years. The earliest ones were without the depth rating (see lot 174, Rolex Revolution sale 17-04-2008) and the depth rating written in red was produced subsequently for a very short period as seen in this current example, confi rmed by its low serial number (#89383). It is fair to assume that Rolex had likely tested a red rating without meters or feet indication before fi nally settling on the confi guration of ?100m/330ft.? In addition, the reference number inside the caseback of this particular example was initially stamped as 6538 but had been crossed off to bear the new reference number 6536, showing the close link between the Big Crown Submariners and this reference. It is the fi rst time that a Rolex Ref. 6536 with red depth indication is offered at Antiquorum. Only about 10 other examples are known in private collections.