The Squale 1521 Green Ray, reference 1521PROFGR.SQ20L, is a professional dive watch featuring a 42 mm polished 316L stainless steel case and a smoky green dial with printed indices. Powered by the automatic Sellita SW200-1 movement, it offers a 38-hour power reserve and operates at a frequency of 28,800 A/h. The watch includes a unidirectional aluminum bezel, a flat sapphire crystal with anti-reflective coating, and a stainless steel bracelet with a polished finish. Designed for serious diving, it provides water resistance up to 500 meters. (squale.ch)