Seiko Limited Edition Diver’s Prospex Black Series ‘Sumo’ SSC761J1 History: This is the Seiko Limited Edition Sumo SSC761J1, the tropical seas show many expressions as the sun sets, changing its color from a cobalt-blue to a dark jet-black in the silence of the night. The mystical charm of the sea at night makes night diving a sought-after activity for those fascinated by the contrasting appeal from the sea at daytime. Today, a series of all-black diver\'s watches inspired by the dramatic and mysterious world of the nighttime ocean is born. Style: This watch combines practical functions of a wristwatch with the waterproof functions of air diving. It is part of the Black series, of which more information can be found here . This model in particular has a limited number of just 3,500 which is serialized on the case back. The impressionable orange accent of its design also make these watches perfect for daily use. Black hard-coating is applied to the stainless steel case of the watch whose design has long been popular amongst wearers by the nickname \"SUMO.\" The orange of the minute hand echoes the light flashed in the dark sea by the night divers which allows for the exact time to be read under dark conditions. Finally, a black silicone strap which has an accordian style can be fastened using a standard buckle. Functions: Seiko\'s unique Lumibrite ensures legibility in the dark world of the night sea. The watch\'s markers are applied with a special Lumibrite in the same orange color. The watches are water-resistant to 200 meters and has a screw-down crown to ensure the safety of the divers. This model in particular is powered by one of Seiko\'s best movements, the solar V192. The watch is powered by the suns rays which allows for an incredible accuracy of +-15 seconds per month. The dial features three subdials which have a variety of uses. The dial at three o\'clock acts as a 24 hour display with the dial at 6 o\'clock displaying the seconds. Also, the subdial at nine o\'clock is a chronograph, perfect for measuring a nightime dive. The bezel is unidirectional which prevents any knocks from any scuba equipment. The movement also has a overcharge prevention which prolongs the life. Made In Japan: For all you Seiko enthusiasts, this premium timepiece has been made and produced in Japan, indicated by the suffix ‘J’. Seiko watches made in Japan are notoriously hard to obtain outside of Japan due to the highest quality of craftsmanship and astonishing features that come in each timepiece. We have a range of Japanese watches here at Watchnation but in limited quantities, so if you are looking to add to your collection then this is the perfect place for you. Key Features: V192 Caliber Solar Movement +-15 Seconds Per Month Stainless Steel Case Hard Coating Sapphire Crystal LumiBrite Silicone Strap 200m Water Resistant Thickness: 13.7mm Diameter: 44.5mm Length: 51.6mm 207mm Bracelet Perimeter LIMITED EDITION On Case Back Screw Case Back Screw Down Crown Serial Number On Back Unidirectional Bezel 24 Hour Hand Chronograph Date Display Resuming Electric Power Generation Overcharge Prevention Small Seconds Hand     The Prospex Story: Scuba-diving became increasingly popular around the 1960’s, an example of this was the formation of the Professional Association of Diving Instructors (PADI) in 1965. Diving equipment was becoming increasingly reliable, so more people began to dive recreationally. There was of course a crucial need for divers to be able to time their dives. Subsequently, the watch market responded to this necessity by flooding the market with dive watches. In 1965, Seiko first produced their original dive watch - the 6217. This was the first Japanese dive watch and it paved the path for future divers that claim to meet Seiko’s Professional Specifications. The original 6217 was notably worn by the 8th Japanese Antarctic expedition. This model featured bidirectional rotating bezel, distinctive and lumed hands, and an easy-to-grip crown. Although professional divers were still pining for a dive watch that had the capability of going deeper than 300 metres. The Seiko team went about going to produce a watch which was capable of doing so. 1975 marks the release of the first Seiko Prospex, with the ability to be used in 600 metre depth. It\'s first diver watch to use a titanium case instead of a steel case. It was also the first to use a ceramic shroud for diving and the first to use a hybrid analog digital watch with an alarm. Another achievement for the Prospex family was the L-shape single crystal gasket, which prevented any helium escape. This was one of the development teams first aims. There were numerous other milestones that Seiko achieved with the Prospex. Such as in 1986 when Seiko produced a watch that was water resistant to 1000 metres. The Brand: Seiko Seiko’s story began in 1881 with the opening of a shop in Tokyo. Eleven years after the opening of his shop, Hattori opened a clock factory and in 1895 that they began to produce pocket watches. Soon followed by alarm clocks in 1899, and then table clocks in 1902. Then in 1913 Hattori began working on his first wristwatch. Then in 1924, 43 years after the initial opening, Seiko was born with the creation of the first wristwatch. Seiko established itself throughout the 20th century as being a force in the advancements that took place in the watching world. For example, Seiko were the producers of the first winding wristwatch made in Japan. Then in 1964, Seiko became the official timer for the Olympics. And then most notably Seiko unveiled the first quartz wristwatch, the Astron, in 1969. Marking the beginning of the quartz revolution. Or equally impressive the creation of the world’s first TV watch in 1982. And even more relevant today, with our abhorrent use of non-renewable energy sources, Seiko’s Kinetic. This watch had the ability to generate its own power from the movement of the wearer. Ceaseless determination to innovate in every aspect of the watchmaker’s art is what defines Seiko’s history. By embracing this ethos, Seiko has been responsible for a string of advances in the technology of time. The listed technological developments serve as evidence to illustrate the revolutionary impact which Seiko has had on the watchmaking world. They are also remarkably unique in that they manufacture every aspect of every watch in-house. Links: If you have any questions please  click here Click here to join our  facebook  and  Instagram !