Ulysse Nardin Blast Hourstriker

The Ulysse Nardin Blast Hourstriker, reference 6215-400-3B/02, has a 45 mm titanium and gold case with black PVD and a flying tourbillon. The case is 16 mm thick and has a water-resistance rating of 30 metres. Self-winding calibre UN-621 has a silicon escapement and a power reserve of 60 hours. A sapphire crystal covers the openworked dial, through which the striking mechanism is visible. The hourstriker chimes the hours and half-hours, with hammers striking a gong shaped to bypass the rotating cage. A velvet rubber strap is fitted to the watch. The movement incorporates a titanium membrane developed in collaboration with Devialet.