Unimatic U1S-PD3 Modello UnoThe 300M water resistance Professional Diver Modello Uno U1S PD3 is equipped with the Swiss automatic movement Sellita SW200 1 b and features for the first time a lume infused ceramic bezel insert and dual lume feature. The improved construction of the crown tube with its new lock system creates a more secured watertight barrier, elevating it to the highest professional diving standard.