Ulysse Nardin Blast Tourbillon

The Ulysse Nardin Blast Tourbillon, reference 1725-400-3A/02, has a 45 mm titanium and 18k gold case, a flying tourbillon and a rubber strap. At 12.6 mm thick, the case has a water-resistance rating of 50 metres. Self-winding calibre UN-172 has a power reserve of 72 hours, a silicon escapement and 25 jewels, with a frequency of 18,000 vibrations per hour. Individual numbering is engraved on the side of the case. A platinum micro-rotor is visible from the front at 12 o'clock. The regulating cage has an X-shaped construction. The openworked dial displays hours and minutes beneath a sapphire crystal.