Santos-Dumont micro-rotor skeleton watch, large model, 31 mm, automatic mechanical movement, 9629 MC. 18K yellow gold (750/1000) case with blue lacquer, polished blued-steel sword-shaped hands, sapphire crystal and case back, bridges covered in blue lacquer. Varnished blue alligator leather strap, second strap in matte blue alligator leather, 18k yellow gold (750/1000) 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. Limited edition of 150 individually numbered timepieces. Water-resistant to 3 bar (approx. 30 meters/100 feet).