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Seiko Tuna is the name given to Seiko's range of watches designed for scuba and professional diving. In particular, Seiko made these watches with saturation diving or greater depth diving in mind. All of the watches in the Seiko Tuna range are characterized by protective screwed-on shrouds that have earned them the nickname of “Tuna”.
|SBDX013 with legendary Seiko movement, 8L35|
The Seiko Tuna collection boasts of many firsts. The collection was the first to feature a titanium/stainless steel shroud, a monocoque case, an L-shaped gasket, and a vented rubber strap. Primarily built for functionality, the Seiko Tuna watches can withstand great depths as tools for professional divers.
Built in 1975, the first Seiko Tuna watch was created in response to a letter the company received in 1968. A saturation diver from Kure City in the Hiroshima, Japan sent a complaint regarding Seiko divers watches, which the company had been making since 1965. These pre-Tuna models were not robust to impact and could not withstand exposure to deep underwater pressure for prolonged periods.
Seiko engineers took on the challenge to create the “ultimate professional diver’s watch. These engineers, led by Ikuo Tokunaga, decided to develop the new Seiko Tuna watches for saturation diving from the start. Tokunaga and his team began development in 1968 and released the first Seiko Tuna watch seven years later with more than 20 patents.
|Titanium Inner Case with black hard coating and Ceramic Shroud|
Being the top of the line Prospex and arguably the second highest Seiko dive watch(first being Grand Seiko), Seiko gave it the best it had.
The Seiko Marine Master Pro. 1000M Emperor Tuna Ref. SBDX013 is powered by Seiko's iconoic high grade Seiko 26-jewel automatic (8L35) movement which is an undecorated and unadjusted version of the Grand Seiko movement, caliber 9S55. The 8L35 beats at 28,800 bph and has handwinding and hacking features. The movement has a 50 hours of power reserve with an expected accuracy within -10/+15 seconds per day.
|Ceramic Shroud. Monobloc construction. 1000m water resistant.|
The 52mm titanium case is treated with a black super-hard coating. Due to the lack of lugs in the Tuna design, the case is only 52mm lugs to lugs. That means this "Tuna" sits so comfortably on the wrist. In fact we think it fits more like a conventional 45mm watch with lugs. The 52mm case is constructed out of 2 layers, inner and outter case. The inner case is made of titanium and of a monobloc construction. Without a need for a screwdown caseback, the movement is cased from the top, before the dial and the crystal. This allows the watch to be water resistant to 1.000m (in fact, it reached 3.000m affixed to the exterior hull of KAIKO 7000 II, a remotely operated undersea research vehicle) and to be fully impermeable to helium.
The outer case, a.k.a the shroud, is made of highly resistant black ceramic. This outer shell is made both to protect the case from shocks and to prevent any unintentional rotation of the bezel.
|Seiko's Lumibrite needs no introduction|
The SBDX013's dial design is also faithful to the original. Designed with large luminous dots, batons and triangular indexes like the original Tunas and large luminous hands. Both the hands and the indexes are coated with a warm cream colour that matches the idea of a vintage re-issue and that perfectly mixes with the rose gold bezel. The dial's makers and hands are treated with Seiko's Lumibrite for awesome low light visibility. There's a lot of lume on this Tuna. Like a ton of it. Probably, the most we've ever seen on a watch.
Sapphire crystal with anti-fogging coating for added toughness.
The Marine Master Pro. 1000M Emperor Tuna Ref. SBDX013 Tuna comes with a ultra soft subber strap. The lightweight of the Titanium case, the lugs-less design and the soft strap adds to the overall wearing comfort of this watch.