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