Sea-Dweller Triple Six 16660

The first sapphire-crystal Sea-Dweller, with a thicker case, a larger gas escape valve and a unidirectional bezelLunetteLe cadre entourant le verre à l'avant d'une montre., doubling the rating to 4,000 ft / 1,220 m. Date rapideDate rapideA setting function that adjusts the date directly through a crown position, without repeatedly advancing the hands through full days. via cal. 3035; the date disc turned off-white from silver. Made alongside the 1665 until 1983. Early casebacks read “Rolex Patent”, later ones “Rolex Oyster Original Gas Escape Valve”.