Sinn watch 358 diapal rubber the large 42 millimetre diameter of this chronograph and its strikingly domed sapphire crystal glass lend it its elegant form in terms of features the diapal technology makes for a lubrication free escapement the ar dehumidifying technology for enhanced freedom from fogging and specified functional reliability at temperatures between 45c and 80c ensures maximum reliability even under extreme conditions the display features an important additional time measu