Sinn watch 1736 st i 4n 1736011 leather tan possibly one of our favourite sinn dress watches this sinn 1736 st i 4n watch has been manufactured in germany with a stunning mix of stylish design tropes an exquisite self winding mechanism and a luxurious tan calf leather strap having become famed for their many patented technologies sinn have enhanced this 1736 st i 4n watch with their sinn d3 system this unique technology allows the push piece pins and crown shafts to be mounted directly in