Founded in 1959 in Neuchâtel, Switzerland, Squale has built a strong reputation for producing professional dive watches trusted by commercial divers and maritime forces worldwide. The 1521 collection is the brand’s most iconic line, known for its distinctive case shape, robust build quality, and true tool-watch functionality.
The Squale 1521 Classic COSC, reference 1521COSCL.SQ20B, features a 42 mm stainless steel case with the signature “von Büren” design and a matte black dial with large luminous hands and markers for optimal underwater visibility. As a chronometer-certified model, it represents one of the highest-precision versions of the 1521 line. Powered by the Swiss automatic COSC-certified Sellita SW200-1 top grade movement, it offers a 38-hour power reserve, a frequency of 28,800 vph, and functions including hours, minutes, central seconds, and a date display at 3 o’clock.
A scratch-resistant sapphire crystal with anti-reflective coating ensures clarity, while the unidirectional rotating bezel with black insert provides precise dive timing. With 500 meters of water resistance, a screw-down crown, and Squale’s proven dive engineering, the 1521 Classic COSC is built for demanding underwater environments. This model is fitted on the steel bracelet and comes with an additonal Squale leather strap. 
This Squale 1521 Classic COSC is from November 2025 is in near mint condition and comes as a full set. We are proud to offer a two-year warranty on every Rolex watch offered by us. Other brands come with a one-year warranty unless otherwise mentioned. The warranty includes the functioning of the watch including the functioning of any present complications. Excluded from the warranty are: water damage, turn and push buttons, crystal, watch strap and clasp.