Santos-Dumont watch, large model, mechanical movement with manual winding 430 MC. 18K yellow gold (750/1000) case, beaded crown set with a blue cabochon-shaped sapphire, sunray-brushed taupe gray dial with Arabic numerals, gold-finish polished steel sword-shaped hands, sapphire crystal. Case back engraved with the handwritten signature of Alberto Santos-Dumont. Gray leather strap, 18K yellow gold (750/1000) ardillon buckle. Case dimensions: 43.5 x 31.4 mm, thickness: 7.3 mm. Water-resistant up to 3 bar (approx. 30 meters/100 feet).