Santos-Dumont watch, large model, Manufacture mechanical movement with manual winding, caliber 430 MC. Steel case with black lacquer, steel beaded crown set with a blue synthetic spinel cabochon, black square decoration dial with translucent lacquer, Roman numerals, steel sword-shaped hands, sapphire crystal. Case back engraved with the handwritten signature of Alberto Santos-Dumont. Black calfskin strap, steel ardillon buckle. Case dimensions: 43.5 mm x 31.4 mm, thickness: 7.3 mm. Water-resistant up to 3 bar (approx. 30 meters/100 feet).