Sinn Watch 1739 St I 4N Leather Tan 1739.011 Leather Tan.  Taking inspiration from the elegant dress watches of the 1970’s, Sinn have launched a new selection of Sinn 1739 watches this time with a smaller 39 millimetre case size. The Sinn 1739 St I 4N watch provides a timeless aesthetic that beautifully illustrates the brand’s sense of tradition, a philosophy reinforced by the finely detailed dial delivered with a silver electroplated finish and adorned in a sunburst decoration and gold plated hands and appliques. The dial is presented in the centre of a classic stainless steel case, polished and measuring to an easy-going 39 millimetres. Sapphire crystal glass with anti-reflective treatment on both sides protects the Sinn 1739 St I 4N watch and delivers exceptional legibility of the sleek hour and minute hands. Powering these functions and providing a power reserve of 42 hours is the Swiss made SW300-1 self-winding movement which comes equipped with 25 bearings and promises 28,800 semi-oscillations per hour. The Sinn 1739 St I 4N watch continues to impress with a transparent case back which exposes the movement within and a screw down crown engineered with the brand’s legendary D3-system for incredible robustness and a healthy water resistant rating of 100 metres.