Titanium provided strength, light weight and resistance to corrosion and magnetism. The case was made from titanium, the first dive watch to be crafted from the metal, which is notoriously difficult to machine. To provide high pressure resistance capable of standing up to the tremendous depths it would face, the Professional Diver’s was made with a one-piece case, which eliminated the screw-on back entirely and necessitated loading the movement from the top of the watch. Seiko engineer Ikuo Tokunaga spent five years developing the world’s most advanced diving watch, built for the tiny target market of offshore commercial divers. He responded with over 20 patented innovations. Tokunaga isn’t a diver, but he approached the problems described in the diver’s letter with an engineer’s knack for problem solving, tackling each issue separately: a 350m working depth pitch-black, cold conditions high-impact work and the helium-saturated living environment which was presenting a unique problem to wristwatches. The professional dive watch project came across his desk, and for the next half decade it became his obsession. Ikuo Tokunaga joined Seiko as an engineer in 1970, working from the company’s factory in Suwa on special projects. It was simply called "The Professional Diver’s." It took seven years, but in 1975, Seiko introduced a watch that addressed all the issues the diver had described and remains to this day perhaps the most capable purpose-built wristwatch of any kind ever made. The letter described how he was destroying dive watches during his work with great regularity, and he requested a solution. In 1968, a letter arrived at Seiko from a commercial diver working in the oil fields off the coast of Japan. The watches designed for reef-combing the Caribbean weren’t cutting it in the harsh environment of the oil fields. This lifestyle takes its toll on the human body, but it also has an effect on their equipment, including their wristwatches. The work of an offshore commercial diver is about as different from recreational scuba diving as flying a fighter jet is from flying a kite - eight-hour shifts on the ocean floor, 600 feet down, welding pipe followed by days living inside a pressurized habitat breathing a helium gas mixture that makes macho divers sound like Alvin and the Chipmunks. While it was built for its functionality, it is also very pleasing to look at.Welcome to Watches You Should Know, a biweekly column highlighting important or little-known watches with interesting backstories and unexpected influence. It also has an L-shaped gasket, a monocoque case as well a rubber strap. The range of watches in this collection has a lot of great things, such as being the first ceramic-coated titanium shroud in the Seiko line. Lastly, the most recent one is called Baby tuna. The following two were called Golden tuna because of their gold-tinted shrouds. The 6159B is known as the grandfather tuna and was the first one in the series. The Seiko Tuna has four major variants: the 6159B, 7549A, 7C46, and 5M23. Since they have protective screwed-on shrouds, they were given the name Tuna. They were made to withstand high pressure and saturation that might occur when diving. Seiko has made these watches with specific conditions in mind. Seiko Tuna is the name that has been given to watches that were specially designed for professional and scuba diving. It is because of a lot of reasons, particularly because it is very pretty and aesthetic. The Seiko Tuna is one of the most popular watches of all time in the Seiko line.
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