Stainless steel, 40 mm Rolex GMT II oyster perpetual wristwatch. Circa 1998. Model reference 16710. Calibre 4130 Rolex movement. 40 mm stainless steel case with black dial with dot luminous hour markers and date aperture at 3 o'clock. Sapphire crystal front. Stainless steel Oysterlock bracelet. Comes with Rolex presentation box. In working order. In the mid 50's developments in aviation led to a demand for a watch which showed dual time. Pilots were suffering from jet lag, and this could be minimised by keeping them on home time while away, but of course needed to be aware of local time. Named after Greenwich Mean time, the world's standard time, the GMT master was first released in 1955. It had a red 24 hour hand in conjunction with a rotating bezel with 24 hour calibrations. After a number of model changes along came the GMT master II reference 16710 in 1988. The Ref. 16710 replaced its predecessor the 16760. The new model boosts a new slimmer design with identical functioning calibre. At the time this slimmer case design was a welcome change for a number of Rolex collectors.