The Nautilus collection was introduced in 1976, inspired by the universal shape of a porthole found on virtually all maritime vessels. It has gained style through subtle and carefully calculated changes, while preserving its original spirit. The new Ref. 5711/1 in steel, has a case diameter of 43mm, one millimeter larger than its 1976 predecessor. This slight increase is due to the rounder contours of the lateral hinge ridges.