Limited Edition of 500 Pieces. Sinn Watch U50 S Mother of Pearl S Limited Edition 1050.0201 H Link Bracelet. The diving watch made of German Submarine Steel with a mother of pearl dial. Each of the 500 limited edition diving watches is uniquely numbered and boasts a light reflecting dial that creates an exciting interplay of colour. This iridescent finish is the result of the shimmering black mother of pearl on the dial, which is a feature of this edition. Combining mother of pearl with a diving watch seems only natural, given that they are united by the element water. Whats more, mother of pearl is a naturally occurring product, making each dial unique. The overall design is completed by the Black Hard Coating, which highlights the striking form of the U50 S Mother of Pearl S and its minimalist display. The timepiece is also equipped with special technical features. For example, the case and crown are made of high strength German Submarine Steel. The classification company DNV GL verifies and certifies pressure resistance to a diving depth of 500m and temperature resistance and functionality in accordance with the European diving equipment standards.