Equipped with a sturdy 44 mm-diameter case in satin-brushed steel, the Superocean II 44 dive watch is renowned for its exceptional water resistance to depths of 1,000 m (3,300 ft), and its ultra-legible black or blue dial bearing oversized numerals and hands enhanced with a luminescent coating. A security valve serves to equalize the differences in pressure between the interior and exterior of the case. It houses an officially chronometer-certified self-winding caliber for exceptional performance and accuracy.