Seiko Tuna is the brand name for a line of watches that are designed specifically for professional use and scuba diving. Particularly, Seiko made these watches with more depth or saturation diving in mind. The watches from the seiko tuna-range) are secured with shrouds that are screwed on, earning them the name "Tuna".
Many firsts are part of the Seiko Tuna range. This range is the first to include a ceramic-coated titanium shroud and the titanium monocoque case. It also features a gasket in the shape of an L and a rubber strap that is vented. They are built to be functional Seiko Tuna watches are built for durability. Seiko Tuna watches can withstand extreme depths and serve as tools for professional divers.
The History of the Seiko Tuna
In 1975, the first seiko tuna mod watch was developed as a response to a complaint that the company received in 1968. Seiko divers watches have been made since 1965. A Japanese saturation diver, Kure City, had complained about Seiko divers watches. These pre-Seiko Tuna models weren't sturdy enough to stand up to impacts and were not built to stand up to extended exposure to high pressures underwater.
Divers watches must endure challenging conditions. Divers breathe oxygen and helium at extremely deep depths. Watches' rubber seals are able to absorb the helium. After divers have completed the necessary decompression process, helium is released through special escape valves inside divers watches, without which the watch crystal would crack. You can buy seiko tuna for sale.
Details and Specifications
Movements
The Seiko Tuna can be divided into four different movements including 6159B and 7C46. 7C46 and 5M23A. Each of them was created by Seiko in-house.
Suwa, the company's Suwa Division, created the 6159B movement that runs the Grandfather Tuna as well as the 7549A movement that runs the first Golden Tuna.
6159B was a derivative movement from the 61xx model that was used by Grand Seiko. It was exclusively used for professional Seiko dive watchesand was it was never utilized in other Seiko models.
It's unclear exactly who was the manufacturer of the 7C46 and 5M23A movements of the reissued Golden Tuna and the Baby Tuna However, it was likely Suwa also.
The 6159B movement is home to the most functional jewels in the entire range , having 25 jewels. However the movement 7549A is the smallest, with just five jewels. The 7C46 and 5M23A are closely matched at seven jewels and six , respectively. All watches within the range hack and can be hand-wound. They usually cost 36,000 BPH.
DIALS
Black dials and LumiBrite luminescence are the hallmarks of the seiko tuna mod range. These watches are also known for having markers rather than numbers to indicate the hours. A triangle upside-down indicates the 12-oclock point, while dots or circles mark the hours in other times.
The majority of Seiko Tuna watches bear "Seiko" written on their dials, as well as an indication of the depth range. When Seiko introduced the first Tuna watch, the 6159-7010 model, the dial showed the depth range in the form of "600" instead of "600m." Some believe that this was a mistake however, since the later models of 1975, 6159-7010 and 6159-7019 models show "600m." Others think otherwise , citing watches that have "600" instead of "600m" continued to be used until 1975.
BEZEL
All watches of the Seiko Tuna series feature a uniform, unidirectional bezel that rotates. It displays divers the length of time they have been underwater and how long it taken to reach there. One click equals one turn and every rotation is for a half-minute. To rotate the bezel there are two access points on the shroud. Divers need to look at the minute the hand points to determine the length of time it has been since the bezel was made.
