Oris Watch Big Crown ProPilot Altimeter Meters. 01 733 7705 4164-07 5 23 17FC Since it produced its first pilots watch in the 1930s, Oris has pioneered a number of innovations that have made it a favourite among flyers. This spectacular Oris Big Crown ProPilot Altimeter watch follows suit and becomes one of the most innovative pilots watches in history. Its immaculate automatic mechanical movement comes fully equipped with a barometric altimeter and barometer movement, becoming the first of its kind in the world. Designed for high-performing pilots, mountaineers and explorers who work at altitude, this Oris Big Crown ProPilot Altimeter watch allows you to measure altitude up to 4,500 meters. With two crowns fitted to the right hand side of the 47mm stainless steel case, you can adjust the time and date and wind the watch with the one at 2 o clock and operate the altimeter function with the screw down crown at 4 o clock. As well as providing access to the altimeter, the Oris 733 automatic winding movement also delivers classic hour, minute and seconds hands, a date window at 3 o clock and a power reserve of 38 hours. The sporty black dial of this Oris Big Crown Altimeter watch is decorated in accents of red and yellow alongside Superluminova coated numerals and indices. Sapphire crystal glass with anti-reflective treatment protects the dial while the two screw-in crowns and screwed down case back ensure a water resistance of 100 metres.