Rolex GMT Master II Root Beer, year 1991, model 16713, number 63319X. Caliber 3185, No. 6391971, for men / Unisex.In steel and gold. Circular case with sphere in "beer" color. Point numbering. Like all Rolex Professional watches, the GMT Master II offers great readability in all circumstances, especially in the dark, thanks to its Chromalight display. Its broad hands and simple-shaped indexes - triangles, circles, rectangles - are coated with a long-lasting luminescent material. Calendar at 3 o'clock with Cyclops lens. Sapphire crystal. Bi-color rotating bezel. Oyster bracelet in steel and gold with folding clasp. With its original box. Automatic movement. It works. Measurements: 40 mm (case diameter); 47 x 43 mm (total case with crown).Designed to display the time in two time zones simultaneously during intercontinental flights, the GMT-Master is known for its rugged and versatile appearance.