Unimatic U1S-PD5 Modello UnoModello Uno U1S PD5 is the first UNIMATIC 500M water resistance professional diver. Equipped with the Swiss automatic movement Sellita SW200 1 b it 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.