Bearing All The Hallmarks Of A Classic Ulysse Nardin Diver, This Watch Is Proof That You Cannot Judge A Book By Its Cover, And That Beauty Is Not Skin Deep Inside The Stunning Case Is The Powerful UN 816 Movement, An Automatic Movement That Functions At 4 Hz And 28 800 V/H. The Brillance Of The Diamond Hour Markers Of The Diver Lady Recalls The Sparkling Surface Of The Sea.Caliber: UN-816Mechanism: Self Winding Case: Steel, 18kt & Black PVDGlass: SapphireStrap: Rubber