About the History of Sinn Watches process Sinn by wholesalewatches - June 14, 2020June 14, 20200 Back in 1961, Helmut Sinn decided to install his own watchmaking business in Frankfurt am Main. The firm, Helmut Sinn Spezialuhren, specialised in the production of navigation clocks and pilot watches -- an ode to the history of Sinn . Sinn had a target, and that was to create watches so