Santos-Dumont micro-rotor skeleton watch, large model, 31 mm, automatic mechanical movement, 9629 MC. Steel case, polished blued-steel sword-shaped hands, sapphire crystal and case back, bridges covered in gray lacquer Gray alligator leather strap and blue alligator leather strap, steel ardillon buckle. Movement dimensions: 23.2 mm, movement thickness: 4.4 mm, balance: 25,200 vibrations/hour, power reserve approx. 46 hours. Case dimensions: 31 mm, thickness: 8 mm. Water-resistant up to 3 bar (approx. 30 meters/100 feet).