Air pressure, Longines’s new pilot’s watch contains a twist you won't see instantly. There’s just a little triangle at the sting with the dial which, Inspite of currently being beneath the glass, rotates if you change the bezel because of some clever engineering. Doxa teamed up with Watches of Switzerland https://www.watchesworld.com/from-sean-to-daniel-tracing-the-evolution-of-james-bonds-iconic-watch-collection/