01 733 7705 4134-Set 5 23 17FCRef

From Baselworld 2014, the Big Crown ProPilot Altimeter gives altitude in feet with near-real-time change indication through an aneroid capsule pressure-sensing system. The movement is an integrated Swiss mechanical barometric altimeter/barometer from Thommen, running on the Oris 733 (Sellita SW200 base). This grey textile-strapped version (ref. 01 733 7705 4134-Set 5 23 17FC) has a black dial and alternating Arabic numerals/stick indexes.