Purchase a pre-owned Seiko Tuna
You can buy a pre-owned Seiko Tuna dive here. These watches come from our daily updated selection of this classic diver’s watch. The best deals from trusted sellers at low prices
HOMAGE to the Tuna – Customers who admire the aesthetics of the Tuna dive watch may also like the Steeldive Tuna homage version. Not a fake, moreover a respectful and affordable tribute to this innovative dive watch
Introducing the Tuna Divers Watch
Of all the Seiko ISO rated dive watches the Seiko Tuna has the most distinctive / original design, in fact, possibly of all the dive watches on the market (exception Omega PloProf). This unique design comes more from necessity than aesthetics. The key to this styling lies in the depth this watch can withstand. The Seiko Tuna range (that’s a nickname – not an official Seiko nomenclature) is a PROFESSIONAL diver’s watch capable of withstanding the pressure from depths of 600m (now 1000m). When diving at these depths a combination of mixed gases are used to protect the diver’s from “the bends” (1). If you are not familiar with the range please browse our short history of the Seiko Divers – starting with the Seiko 6217-8000 in 1965 and the Seiko 6105-8000 in 1968.
Helium Release Valve – superfluous
A proportion of these mixed gases is HELIUM. And there lies the problem. Helium particles are TINY … really TINY. They are small enough to enter the casing of a watch water resistant to even 600m. The problem arises during decompression. The helium gas cannot get out quickly enough. There is a build up pressure inside the watch which may cause the glass to blow off.
Titanium casing & special gasket
Seiko looked outside the box for solutions. Instead of looking to ways of allowing the helium to get out … they stopped it entering in the first place. With a specially designed gasket and the titanium monochoque casing the problem was solved in a unique fashion. That was back in 1975 that the world was first introduced to the Seiko Tuna. The initial watches were driven by Seiko’s 6159 Calibre (3) – 26 jewel – automatic movement.
Seiko Tuna – with a history back to 1978
The history of the Seiko Tuna goes back, way back to the late ’70s. In fact, it was in 1978 that the Seiko Professional Diver’s 600M became the world’s first saturation diving watch featuring a quartz movement in 1978.
Driven by the 7549 calibre the Seiko Tuna was establishing itself as THE professional divers watch. In fact, to reinforce it’s superiority and prove it’s reliability Seiko undertook an amazing test. For instance, in 1983 the Seiko Tuna with 7549 quartz movement was was strapped to the research submarine “SHINKAI 2000” (5). Accordingly, down it went to an official depth of 1,062 meters below sea level. To emphasize, that’s nearly twice the maximum depth this watch is rated to. Needless to say, the Tuna performed with perfect accuracy. Due to this outstanding performance the Tuna booked it’s place in the Dive Watch Hall of Fame – and for very good reason.
200m to 1000m
The current line up of Seiko Tuna can withstand dive depths from 200m to 1000m. Since their introduction in in the late 1970’s the Tuna has been produced with all available Seiko movements from automatic (self winding), quartz, kinetic and solar.
New & Used Seiko Tuna for sale
There are dozens of new & pre-owned Seiko Tuna watches available to buy online. For example, here are some Seiko Tuna added for sale today. The list below was updated on the 14/06/2021
- Seiko SNE498 Solar Tuna Diver Watch Black Golden Dial 2020 Posted : 14 June 2021 11:38 am
Brand : Seiko Model : Tuna Price : £310.00 Selller : metalsanchris Condition : Used Location : Southsea, United Kingdom Ships to : United Kingdom Sale by : buy it now Bids : Ends on : 2021-07-14 07:30:29 Time Remaining : Warranty : check listing Certificate of Authenticity : check listing Description : Seiko SNE498 more about this Seiko Tuna
- SEIKO PROSPEX URBAN SAFARI TUNA NEW MEN’S AUTOMATIC 200m DIVER’S WATCH SRPE31K1 Posted : 14 June 2021 2:38 am
Brand : Seiko Model : Tuna Price : £369.99 Selller : olyed Condition : New with tags Location : Preston, United Kingdom Ships to : United Kingdom and many other countries Sale by : auction Bids : 0 Ends on : 2021-06-20 19:05:34 Time Remaining : Warranty : check listing Certificate of Authenticity : check more about this Seiko Tuna
- Rare Seiko Prospex SRP655k1 50th Anniversary Special Edition Baby Tuna Rare! Posted : 14 June 2021 2:35 am
Brand : Seiko Model : Baby Tuna Price : £475.00 Selller : bladerunnerii Condition : Used Location : Calne, United Kingdom Ships to : United Kingdom Sale by : auction Bids : 0 Ends on : 2021-06-20 18:00:58 Time Remaining : Warranty : check listing Certificate of Authenticity : check listing Description : Rare Seiko more about this Seiko Tuna
Seiko refresh their Prospex dive watches quite frequently. While writing this article (June 2019) there were just 4 versions of Prospex dive watches with the “Tuna can” style case. Namely the S23627J1 and S23626J1 are two limited edition models with the 7C46 quartz movement. However, these two models are quite hard to find being collectors items. Currently, prices range from £2,000 to £2,700. For a more modest budget of around £600 there is the SRPA83K1 with a water resistancy of 200m – driven by the bomb proof Calibre 4R36 automatic movement.
My personal favourite is the Seiko SBDX014G. This Marinemaster professional dive watch is certified to 1000m. Furthermore, for £3,250 you get the luxurious mechanical calibre 8L35 automatic movement with 26 jewels providing an accuracy of +15 to -10 seconds per day and a 51 hour power reserve.
- Ceramic/titanium (hard coating) with stainless steel bezel
- Thickness: 17.2㎜
- Diameter: 52.4㎜
- Length: 53.5㎜
- Approx. 50 hours
- +15 to -10 seconds per day
- Lumibrite on hands and indexs
- 1000m / 3300ft for saturation diving
- 26 jewels
- Date display
- Screw-down crown
- Stop seconds hand function
- Unidirectional rotating bezel
Seiko Tuna Videos
Seiko Prospex Marine Master Professional SBDX014G
Peter Alexander Manthos – his take on the Seiko Prospex Marine Master Professional SBDX014G
Seiko PADI Monster Tuna – SRPA83K1
Watch Videos – a full review of the PADI baby Tuna 200m dive watch
Authorised Seiko Prospex shopping partner
Our online shopping partner sells the entire range of Seiko Prospex dive watches. Shop with confidence at Jurawatches. Get the assurance of a genuine Seiko Prospex watch from an authorised dealer.
This is what our shopping partners say about the Seiko Prospex range
“Discover our stunning collection of Seiko Prospex watches designed especially for sport lovers and adventurers in mind. Since the first Seiko Prospex Divers watch was released in 1965, the brand have continued to challenge and expand on their designs to create a range of Japanese diving and sport watches that provide exceptional functionality and striking visual appeal”
If you found this page via a search engine – please visit our generic Seiko Divers watch history page for more information on all Seiko Prospex models since 1965. There’s general information on all iconic styles from Japan’s leading manufacturer of quality dive watches. If you are in the market for a new watch then please browse the hundreds of Seiko Dive Watches for sale here
External references / further reading
- (1) EmedicineHealth.com : The Bends – decompression sickness
- (2) MonoChrome watches : Hisory of The Seiko Tuna
- (3) Fratello Watches : The history of the Seiko Tuna
- (4) The Springbar : Seiko Tuna Collectors guide
- (5) SeikoWatches : Prospex Dive watch history