Seiko Tuna Dive Watch

The Seiko Tuna is a professional diver’s watch that can withstand depths up to 1000m. From the globally popular range of Seiko diver’s watches this is the one certified for the deepest dives.

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HOW DEEP – how about 1000 metres

Of all the Seiko Diving watches the Tuna is the first choice for many professional divers. It’s ongoing popularity 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 1000 metres

Fine examples of Tuna Dive Watch discovered on eBay

All the watches below were found on eBay. eBay is a great place to go to check a) the current prices of a specific watch and b) to see what the watch looks like in the “real world”. Most product photos on eBay are taken with great care to best represent the watch. You get to see what it really looks like (not a computer enhanced brochure photo)

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Innovation – no helium escape valve

Of all the Seiko dive watches the 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.  When diving at extreme depths a combination of mixed gases are used to protect the diver’s from “the bends” (external reference *).

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 1000m. 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.

Patented Gasket Solution

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 – 26 jewel – automatic movement.

Seiko Prospex Tuna Marinemaster 1000M Automatic Watch SLA042J1/SBDX038 DE*de

In 1978 that the Seiko Professional Diver’s 600M became the world’s first saturation diving watch featuring a quartz movement. 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.

In 1983 a Seiko Tuna with the 7549 quartz movement was strapped to the research submarine “SHINKAI 2000” (external reference *). 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.

1000m Water Resistancy – with this Seiko Tuna Marinemaster

The example shown below is a Limited Edition Quartz Seiko Tuna Marinemaster – water resistant to 1000m. This one is quite rare, notice the white ceramic helium escape gasket. For the record it’s a Seiko SBBN019 also known by it’s nickname as the Seiko White Dolphin (sometimes the Beluga or even the Storm Trooper). It was produced to celebrate 45 years since the first Tuna diver’s watch. Being one of a very limited run of just 300 timepieces – this one would fetch a premium if it were sold today – somewhere in the region of £1,750 / $2,000.

Seiko Tuna sbbn019 prospex 1000 m

Nicknames of the most popular Tuna Dive Watches

The Tuna range is littered with witty nicknames. Here’s a few: the Darth Tuna (all black version), Mini Tuna (correct, it’s a bit smaller) , Emperor TunaYellow Tuna (yellow bezel and accent on hands) all the way back to aptly named original Grandfather Tuna. Another popular name for the regular version of this watch is the Seiko Baby Tuna. The “baby” refers to the fact that it’s a slightly under-engineered version of the professional MarineMaster version.

Seiko Baby Tuna SRP637K1 with 4R36 calibre automatic movement
SEIKO Prospex BABY TUNA SRP637K1 - FUORI PRODUZIONE SRP637 - 4R36-03Z0

What to pay for a pre-owned Tuna

A question we get asked everyday for practically all the watches listed on the website. It’s all down to popularity, rarity, provenance and condition. Let’s start at the TOP end of the market. Don’t forget these watches are some of the finest timepieces in the world – in my view equaling the quality of some Swiss brands.

The Seiko SBDB013 Spring Drive Tuna Marinemaster is not going to give you any change from £2,500. If it says MARINEMASTER on the dial and it’s genuine, the starting price has to be around £1,000 / $1,000+ for a “basic” automatic model. However, there are plenty of other versions available in particular, the solar and street Tuna models starting at £250.

Consider a Steeldive “Tuna” homage

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. If good quality tribute watches is of interest – we also have our own CD200SKX. There is no doubting the DNA of our design – it’s a true SKX009 homage – right down to the movement inside.

Seiko Tuna watches available today

A selection of Seiko Tuna dive watches listed for sale in the last 24 hours.

To assist in fast tracking your search we have recruited our clever 🐙 OCTOBOT 🐙 to filter a selection of the best pre-owned Seiko Tuna on eBay today. The watches shown below are just a small sample. For ALL the latest new & used Tuna dive watches please click the link below >>

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Flags ( 🇬🇧 & 🇺🇸 ) are used at the start of each listing to identify the country the seller is willing to SHIP TO. If the same watch appears several times – this indicates the seller is able to ship to multiple countries.

Seiko Prospex Solar SNE545 SNE545P1 White Rubber Strap Tuna Street Mens Watch

🇺🇸 delivery : A Seiko Prospex Solar SNE545 SNE545P1 White Rubber Strap Tuna Street Mens Watch. This watch is available now for US$396.91. The seller is located in Sydney, Australia. The condition of this watch has been listed as New with tags. This …

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Seiko Tuna Solar Dive Watch 200m SNE497P1 signed Card, Box & Papers rrp £399

🇬🇧 delivery : A Seiko Tuna Solar Dive Watch 200m SNE497P1 signed Card, Box & Papers rrp £399. This watch is available now for £309.00. The seller is located in Bournemouth, United Kingdom. The condition of this watch has been listed as New with…

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Seiko Prospex PADI Solar Tuna Diver’s 200m Men’s Watch SNE499J FROM JAPAN

🇺🇸 delivery : A Seiko Prospex PADI Solar Tuna Diver’s 200m Men’s Watch SNE499J FROM JAPAN. This watch is available now for US$405.00. The seller is located in tokyo, Japan. The condition of this watch has been listed as New with tags. Th…

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Seiko ‘ninja’ 300m tuna SBBN035

🇬🇧 delivery : A Seiko ‘ninja’ 300m tuna SBBN035. This watch is available now for £575.00. The seller is located in Douglas, United Kingdom. The condition of this watch has been listed as Used. This watch is being sold by a seller with th…

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Seiko x Padi Tuna Automatic 7S26 Day/Date Blue Dial Air Diver Men’s Wristwatch

🇺🇸 delivery : A Seiko x Padi Tuna Automatic 7S26 Day/Date Blue Dial Air Diver Men’s Wristwatch. This watch is available now for US$495.00. The seller is located in Qila Didar Singh, Pakistan. The condition of this watch has been listed as Pre-…

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Seiko Prospex SBDN029 Diver Scuba Limited Edition FSC Solar Mens Watch Tuna

🇬🇧 delivery : A Seiko Prospex SBDN029 Diver Scuba Limited Edition FSC Solar Mens Watch Tuna. This watch is available now for £595.00. The seller is located in Milton Keynes, United Kingdom. The condition of this watch has been listed as New with tag…

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SEIKO Prospex SBDX013 Marine Master Emperor Tuna Automatic 1000M Pro Diver Watch

🇺🇸 delivery : A SEIKO Prospex SBDX013 Marine Master Emperor Tuna Automatic 1000M Pro Diver Watch. This watch is available now for US$3,000.00. The seller is located in Jp, Japan. The condition of this watch has been listed as Pre-owned. This watch i…

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Seiko 300m Tuna L Seal Set

🇬🇧 delivery : A Seiko 300m Tuna L Seal Set. This watch is available now for £15.99. The seller is located in derbyshire, United Kingdom. The condition of this watch has been listed as New with tags. This watch is being sold by a seller with the user…

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Seiko PADI tuna blue automatic divers watch

🇺🇸 delivery : A Seiko PADI tuna blue automatic divers watch. This watch is available now for US$500.00. The seller is located in Hollywood, Florida, United States. The condition of this watch has been listed as Pre-owned. This watch is being sold by…

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SEIKO SBDY053 FROST BABY TUNA JDM DIVE WATCH USED  *UK Seller*

🇬🇧 delivery : A SEIKO SBDY053 FROST BABY TUNA JDM DIVE WATCH USED *UK Seller*. This watch is available now for £449.99. The seller is located in Birmingham, United Kingdom. The condition of this watch has been listed as Used. This watch is being sol…

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Seiko Darth Tuna 1000m 7C46-0AP0 S23631J1 SBBN047 Black Dive Watch Box + Papers

🇺🇸 delivery : A Seiko Darth Tuna 1000m 7C46-0AP0 S23631J1 SBBN047 Black Dive Watch Box + Papers. This watch is available now for US$1,935.91. The seller is located in Paignton, United Kingdom. The condition of this watch has been listed as Used. Thi…

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SEIKO BABY TUNA PROSPEX YELLOW FIN  ** AUTOMATIC DIVERS WATCH** SPARE STRAP!

🇬🇧 delivery : A SEIKO BABY TUNA PROSPEX YELLOW FIN ** AUTOMATIC DIVERS WATCH** SPARE STRAP!. This watch is available now for £650.00. The seller is located in cambrigeshire, United Kingdom. The condition of this watch has been listed as New without …

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More popular Seiko Diver’s watches

The Seiko Samurai featured above is just one of several popular Seiko Dive watches with their own quirky nicknames. Others classic dive watches from Seiko to consider include:

Seiko Monster

The Seiko Monster dive watch is so called because, allegedly, the shape of the bezel was inspired by a shark’s teeth. The Monster has the most aggressive design making it instantly recognizable. First introduced in 2000 in Japan with the Seiko SKX779 (black dial) and Seiko SKX781 (orange dial). More about the Seiko Monster dive watch.

Seiko Monster Dive Watch

Seiko SKX009 / SKX007

Of all the Seiko dive watches that have ever graced our wrists & oceans – the Seiko SKX007 and Seiko SKX009 are two of the most popular. This short history of the Seiko SKX009 and SKX007 tells us they were first introduced in 1996. At the time no one could have predicted their success and longevity. All models incorporated the Seiko 7S26 automatic (self winding) movement. Older models can be identified by their 150m water resistancy, newer ones were certified to a depth of 200m.

The Seiko SKX007 and SKX009 divers watch range

Seiko Turtle

The Seiko Turtle is an iconic diver’s watch made famous by the Apocalypse Now movie. From the ever popular range of Seiko dive watches this is the one with the smooth, cushion like case. Initially released in 1976, the original Turtle (Seiko 6306 & Seiko 6309) was in production from 1976 until 1988. More about the Seiko Turtle dive watch

The Seiko Turtle Diver's Watch
Further Reading