The cannon pinion holds and powers the moment hand. The slower-rotating hour wheel and hour hand is powered through the cannon pinion throughout the velocity-decreasing moment wheel. The Nomos AHOI Siren Blue is an elegant look at with a beautiful siren blue dial. The case diameter is 40.3mm, that is https://tedomarket.com/product/mens-watches/mechanical-watches-mens-watches/waterproof-turtle-automatic-watch/