IIn 1983, Rolex introduced the GMT-Master II, the original version of which bore the reference 16760. The 16760 featured the new caliber 3085 movement, which separated the hour hand from the large triangle 24-hour hand, to provide instantaneous setting of the second time zone on the face of the watch itself. Further, the seconds hand only hacked when the crown was pulled all the way out to the standard time-setting position, while it continued running when merely setting the hour hand to the new destination time. This enabled the GMT-Master II to maintain the legendary Rolex accuracy without interruption while traversing the globe. And now, since home time & local time could be read simultaneously on the face of the watch, the rotating bezel could be used to calculate a third time zone if needed. The watch was also the first GMT to be produced exclusively with a sapphire crystal. The rotating bezel gained a ratcheting action and the bezel insert was only offered in the new color combination of black and red. The 16760 featured an extra-thick case, some .5mm thicker than its predecessor, as well as a thicker bezel and crown guards. This has led to collectors names of ?Fat Lady? and ?Sophia Loren.? Produced only until 1988, the short-run 16760 was replaced by the much longer running ref. 16710.