Black Bay 41mm "On the Fly" Extension Link Model Number:79540 Four indexed positions

Four indexed positions

the hour hand simultaneously indicates both local time on the dial and the secondary time zone on the bezel

By balancing the link count

making it intuitive

this bezel merges precision engineering with luxurious aesthetics—crafted to match OEM standards and elevate your timepiece with a refined

Black Bay 41mm "On the Fly" Extension Link Model Number:79540 Four indexed positionsYOUR BRACELET IS NEVER THE PERFECT FIT Morning: perfect. Afternoon: too tight. Evening: too loose. Heat, cold, and movement change your wrist your bracelet cant keep up. On The Fly fixes that with instant, tool free 5 mm adjustment, completely hidden under your clasp. Youll never see it, and neither will anyone else except theyll notice your watch always sits perfectly. Always Perfect Comfort on demand, in seconds. Invisible Upgrade Discreetly tucked