Sinn Watch 103 St. 103.031 Vintage Cowhide Brown. A vintage inspired pilots watch with a whole lot of functionality, this Sinn 103 St is destined to fly the skies on your wrist. Its remarkable pilots bezel is highly legible and easy to use with minute ratcheting and a luminous key mark, and with a water resistance of 200 metres, the bezel also provides capability for diving thanks to its unidirectional functionality and 60 minute scale around the edge. Measuring to 41mm in size, the case of this Sinn 103 St watch is perfectly engineered for endurance and legibility. It comes fitted with shock resistant acrylic glass, screw down crown and a screw fastened case back which hides away the automatic movement within. The German watch is paired with a Swiss movement, the Valjoux 7750. This famous chronograph calibre provides a power reserve of 42 hours alongside central hands for hour, minutes and chronograph seconds, date and day of the week display and three subsidiary dials for continuous seconds, 12 hours and 30 minute counters. To complete the look of this Sinn 103 St watch, the stainless steel case is paired with a matte black dial with luminous hands and indexes and a sophisticated vintage cowhide brown leather strap.