Ulysse Nardin Executive Skeleton Tourbillon 1713-139/43. Caliber UN-171 with a 170 hours power reserve. Flying Tourbillon complication. Luminescent hands with index hour markers and roman numerals for 12, 3 and 9 positions. Transparent dial. Fixed ceramic bezel set on a 45mm titanium case. Sapphire crystals on both top and back. Water resistant to 30M. Leather strap with carbon structure and triple folding deployment clasp.