Sinn Watch 104 St Sa I B Cowhide Vintage Brown. 104.013 Cowhide Vintage Brown. Sinn are renowned for their high-quality pilot watches and this Sinn 104 St Sa I B watch continues their heritage by bringing to life an aesthetic reminiscent of cockpit navigation clocks and their rapid and clear readability. Complimented by retro touches, a nautical blue dial and uncompromising specifications, this Sinn watch is a must-have timepiece for fans of vintage-inspired aviation watches. At its centre, the distinctive dark blue sunray decorated dial delivers exceptional legibility with the help of hour, minutes and seconds hands, box-shaped indexes and a triangle marker on the captive pilots bezel treated with luminescent coating. As with all of Sinn’s pilot watches, the 104 St Sa I B model guarantees absolute robustness and precision with a polished 41mm stainless steel case equipped with sapphire crystal glass above the dial and on the exhibition case back treated with anti-reflective coating on both sides. Housed within the case and protected by a 200 metre water resistant screw down crown is the SW 220-1 self winding movement which alongside 26 bearing jewels and a frequency of 28,800 semi-oscillations per hour delivers a power reserve of 38 hours and a large day and date window at 3 o’clock. To complete the look of this Sinn 104 St Sa I B watch, a vintage brown calfskin leather strap is added fastened by a stainless steel pin buckle signed off by the iconic Sinn logo.