Sinn watch 900 diapal leather the 900 diapal brings together a number of different sinn technologies which when combined yield maximum reliability in terms of time measurement and functionality worthy of particular mention here is diapal technology for a lubrication free anchor escapement this is documented by the diapal lettering on the electroplated charcoal grey dial as a result of this extraordinary technology we offer a five year warranty on the 900 diapal the large pilot chronograph