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Seiko Tuna


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Seiko Prospex Titanium Blue No numerals United States of America, Pennsylvania, Douglassville
Seiko Prospex
Trilogy Tuna Can - 1975 DIVER SLA041
$4,777
+ $90 for shipping
Seiko Prospex Steel 43.20mm Green United States of America, California, Burlingame
Promoted
Seiko Prospex
SRPF83K1 - Street Series 'Tuna' Safari Green Dial Edition Watch
$449
Free shipping
Seiko Titanium 51mm Black No numerals United States of America, North Carolina, Hendersonville
Seiko
Grandfather Tuna "M Dial" Titanium 6159-7010
$5,290
+ $29 for shipping
Seiko Steel 52mm Black No numerals United States of America, Ohio, Yellow Springs
Seiko
Baby Tuna SRPA79J1
$600
Excl. shipping
Private Seller
Seiko Steel 38.6mm United States of America, Georgia, Douglasville
Seiko
Tuna
$499
Excl. shipping
Private Seller
Seiko Prospex Titanium 49mm Black United States of America, Florida, Pompano Beach
Seiko Prospex
40th Anniversary Golden Tuna Limited Edition SBBN040 1000m Diver
$2,795
+ $49 for shipping
Seiko Prospex Steel 47.5mmmm Black No numerals United States of America, Florida, Sarasota
Seiko Prospex
SUN023 47.5mm - Solar PVD Diver Tuna GMT Men's Watch
$475
Free shipping
Seiko Marinemaster Steel 47mm Black No numerals United States of America, New Jersey, Upper Saddle River
Seiko Marinemaster
Tuna - Profesional 300M 7C46-7010
$995
+ $29 for shipping
Seiko Prospex Steel 43.2mm United States of America, Ohio, USA
Seiko Prospex
Tuna Automatic - Antarctica Edition SRPH77 ( NEW ) FREE SHIPPING
$550
Free shipping
Seiko Steel 50mm Black United States of America, New York, Brooklyn
Seiko
Big Tuna Air Diver 4R36-05T0 50mm Stainless Steel Ceramic Mens Watch
$1,000
+ $29 for shipping
Seiko Prospex Titanium 52.40mm Blue United States of America, California, Burlingame
Seiko Prospex
SBDX035 - Diver Tuna 55th Anniversary Limited Edition Blue Dial Men's Watch
$4,139
Free shipping
Seiko Prospex Steel 47,8mm Gold No numerals
Seiko Prospex
SRPE14K Zimbe Limited Edition Tuna Very Good Full Set 02-2020
$1,127
Free shipping
Seiko Marinemaster Titanium 49.4mm
Seiko Marinemaster
Prospex Marine Master Professional SBBN025 7C46-0AH0 Quartz
$1,345
Free shipping
Seiko Marinemaster Ceramic 48mm Black
Seiko Marinemaster
Marine Master Automatic Professional "Emperor Tuna" - SBDX014
$4,020
+ $245 for shipping
Seiko Prospex Steel 46.7mm Black No numerals United States of America, Oregon, Tigard
Seiko Prospex
Black Series Limited Edition Ninja Solar Tuna
$479
+ $8 for shipping
Seiko Prospex Steel 47mm Grey No numerals United States of America, Florida, Sarasota
Seiko Prospex
SNE537 47mm Tuna - Grey Rubber Diver Solar Quartz Men's Watch
$325
Free shipping
Seiko Prospex Steel 46.7mm Black No numerals
Seiko Prospex
Black Series Limited Edition Tuna Solar
$392
+ $29 for shipping
Seiko Prospex Steel Black United States of America, Kentucky, USA
Seiko Prospex
Tuna Dive Watch Solar 200m ( NEW )
$499
Free shipping
Seiko Prospex Steel 51mm Black No numerals
Seiko Prospex
Tuna SRPA79 Diver
$280
Excl. shipping
Private Seller
Seiko Prospex Titanium 49.4mm Black No numerals
Seiko Prospex
2018 “1000M GOLDEN TUNA” Re-editions S23626J1
$1,264
+ $103 for shipping
Seiko Prospex Titanium 52.4mm
Seiko Prospex
Tuna SBDX029
$2,515
+ $248 for shipping
Seiko Prospex Steel 49mm Black
Seiko Prospex
良品箱付き - セイコー プロスペックス マリーンマスター デイデイト 7C46-0AA0/SBBN013 クォーツ メンズ_707665 中古
$1,075
Free shipping
Seiko Prospex Steel 47.5mm Black No numerals
Seiko Prospex
Tuna
$1,417
+ $59 for shipping
Seiko Prospex Titanium 49.4mm Black No numerals
Seiko Prospex
S23626J1 „Golden Tuna”
$2,542
+ $68 for shipping
Seiko Prospex Steel 46.7mm Black No numerals
Seiko Prospex
Black Series Limited Edition Tuna Solar
$436
+ $127 for shipping
Seiko Prospex Titanium 49.4mm Black No numerals
Seiko Prospex
800 pcs limited TUNA divers SBBN042 (NEW)
$2,196
+ $71 for shipping
Seiko Prospex Steel 43.2mm Green No numerals United States of America, Ohio, USA
Seiko Prospex
Men's Green TUNA ( NEW ) SRPF83 FREE SHIPPING
$599
Free shipping
Seiko Prospex Steel 43mm Green
Seiko Prospex
Tuna Divers
$399
Excl. shipping
Private Seller
Seiko Marinemaster Steel 46mm Black
Seiko Marinemaster
Prospex - Tuna SBBN015
$1,225
+ $103 for shipping
Seiko Steel 47mm Orange
Seiko
limited edition chronograph Quartz Italian Tuna Y187-7A30 vintage
$676
+ $97 for shipping

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Seiko Marinemaster Steel 52mm Black
Seiko Marinemaster
箱・保証書付き - セイコー プロスペックス マリーンマスター デイト SBDX014/8L35-00H0 自動巻き メンズ_708221 中古
$2,244
Free shipping
Seiko Prospex Steel 43mm Black No numerals
Seiko Prospex
Tuna Safari
$510
+ $59 for shipping
Seiko Marinemaster Steel 48mm Blue
Seiko Marinemaster
Tuna Marine Master JDM Divers Limited Edition Watch SBBN037
$1,050
+ $99 for shipping
Seiko Prospex Steel 43mm
Seiko Prospex
Uomo/Donna - SRPF81K1 - ProspexProspex - Tuna - SRPF81K1
$480
Free shipping
Seiko Marinemaster Titanium 44.8mm Blue
Seiko Marinemaster
セイコー プロスペックス SBDB0131 - WATCH SALON 限定品 スプリングドライブ メンズ M
$3,102
Free shipping
Seiko Prospex Steel Grey United States of America, Ohio, USA
Seiko Prospex
Solar "Tuna" Dive Watch SNE537 ( NEW )
$599
Free shipping
Seiko Prospex Steel 43.2mm Orange No numerals
Seiko Prospex
Zimbe 16 Mini Tuna SRPJ55K
$1,000
Excl. shipping
Private Seller
Seiko Marinemaster Titanium 52.4mm Black No numerals
Seiko Marinemaster
Automatic Professional "Emperor Tuna" - SBDX014
$3,238
+ $103 for shipping
Seiko Prospex Steel 50mm Blue No numerals
Seiko Prospex
Padi Baby Tuna SRPA83K1 FULL SET
$539
+ $118 for shipping
Seiko Marinemaster Steel 52mm Black
Seiko Marinemaster
良品箱・保証書付き - セイコー プロスペックス マリーンマスター デイト SBDX014/8L35-00H0 自動巻き メンズ_704749 中古
$2,322
Free shipping
Seiko Prospex Titanium 49.4mm Blue No numerals
Seiko Prospex
Tuna 35th Anniversary Limited Edition
$2,471
+ $59 for shipping
Seiko Prospex Steel 43.2mm Grey
Seiko Prospex
Zimbe 16 Thailand SRPJ55 SRPJ55K1 SRPJ55K - Limited Edition Tuna Watch
$900
+ $99 for shipping
Seiko Prospex Steel 42.8mm
Seiko Prospex
Uomo/Donna - SRPG59K1 - ProspexProspex - Antarctica Tuna ʻSave the Oceanʼ - SRPG59K1
$447
Free shipping
Seiko Prospex Steel 44mm
Seiko Prospex
Zimbe No.8 Baby Tuna Limited Edition
$1,062
+ $92 for shipping
Seiko Prospex Steel Black United States of America, Ohio, USA
Seiko Prospex
"Arnie" - Tuna Dive SNJ025 ( NEW )
$459
Free shipping
Seiko Marinemaster 50mm
Seiko Marinemaster
Sbdb013 Spring Drive
$3,321
Excl. shipping
Private Seller
Seiko Marinemaster Steel Black No numerals
Seiko Marinemaster
Prospex Tuna SBBN035
$1,410
+ $103 for shipping
Seiko Prospex Steel 50mm Black
Seiko Prospex
Yellow Fin Tuna
$354
+ $92 for shipping
Seiko Prospex Steel 43.20mm Green
Seiko Prospex
SRPF83K1 - Street Series 'Tuna' Safari Green Dial Edition Watch
$361
+ $85 for shipping
Seiko Prospex Steel 43mm Green No numerals
Seiko Prospex
Tuna Street
$510
+ $59 for shipping
Seiko Prospex Steel 46.7mm Black No numerals
Seiko Prospex
TUNA Diver`s 200m SOLAR Eco Drive
$301
Excl. shipping
Private Seller
Seiko Prospex Titanium 50mm Black Arabic numerals
Seiko Prospex
"New Darth Tuna" 1000m
$1,569
Excl. shipping
Private Seller
Seiko Kinetic Steel 46mm Orange
Seiko Kinetic
Sportuna - Chronograph SNL043
$591
Excl. shipping
Private Seller
Seiko Prospex Steel Green No numerals United States of America, Minnesota, USA
Seiko Prospex
Solar "Tuna" Dive SNE535 ( NEW )
$499
Free shipping
Seiko Prospex Steel 51.7mm
Seiko Prospex
JDM Baby Tuna Ice Frost SBDY053 SBDY053J1 SBDY053J Limited Edition Watch
$628
+ $99 for shipping
Seiko Marinemaster Titanium 49.4mm Black No numerals
Seiko Marinemaster
Prospex Sea Marine Master SBBN025
$1,541
+ $103 for shipping
Seiko Marinemaster Titanium 52.4mm Black No numerals
Seiko Marinemaster
SBDX014
$1,790
Excl. shipping
Private Seller
Seiko Prospex Steel 46.2mm Blue No numerals
Seiko Prospex
'Tuna' Street Series blue SNE533P1
$223
Excl. shipping
Private Seller
Seiko Marinemaster Titanium 52.4mm Black No numerals
Seiko Marinemaster
1000 - Dark Tuna
$2,316
Excl. shipping
Private Seller
Seiko Marinemaster Steel 47.7mm Black No numerals
Seiko Marinemaster
Ninja Tuna SBBN035
$1,471
Excl. shipping
Private Seller

Seiko Tuna: A Distinctive Diving Watch for Pros

The Seiko Tuna series contains tool watches for professional divers. Top models are water-resistant to 100 bar (1,000 m, 3,280 ft). The distinctive outer case gives the Tuna its name and makes it a popular collector's item.


5 Reasons to Buy a Seiko Tuna

  • A professional diving watch with a unique "tuna can" design
  • Top models water-resistant to 1,000 m (100 bar, 3,280 ft)
  • High-precision quartz, automatic, or Spring Drive calibers
  • Coveted collector's items
  • Interesting models with robust titanium cases

An Impressive Tool Watch for Exploring the Deep

The Seiko Tuna is a series of professional diving watches that have been in production since 1975. Of course, "Tuna" is not this timepiece's official name. Instead, this moniker comes from Seiko's fan community, who recognized the resemblance between this watch's distinctive outer case and a can of tuna. Some collectors lovingly refer to these timepieces as "hockey pucks" since most have black cases and are up to 52 mm in diameter.

Every Tuna model has a large outer case that is attached to the actual case by four screws. It reaches up past the unidirectional diving bezel and protects the bezel and case against strong impacts. The wearer can operate the bezel via openings on either side of the outer case, which expose a section of the bezel's toothed edge.

Seiko has been crafting these timepieces out of titanium since the very first model, known as the Grandfather Tuna. Only a few of the more affordable models are made of stainless steel and, in some instances, have a plastic outer case. These editions tend to have lower water resistances. While some titanium versions can survive up to 100 bar (1,000 m, 3,280 ft), the stainless steel editions are water-resistant to a maximum of 20 bar (200 m, 656 ft).

Seiko equips most models with stripped-down Grand Seiko calibers. However, there are also watches with high-quality quartz, kinetic, or Spring Drive movements.


How much does the Seiko Tuna cost?

Model/Reference number Price (approx.) Caliber
Grandfather Tuna, ref. 6159-7010 7,100 USD 6159A high beat
Spring Drive Tuna, ref. SBDB008 4,400 USD 5R65 Spring Drive
Emperor Tuna (2015), ref. SBDX013 3,600 USD 8L35 automatic
Emperor Tuna Rose Gold, ref. SBDX014 2,400 USD 8L35 automatic
Emperor Tuna, ref. SBDX011 2,300 USD 8L35 automatic
Golden Tuna, ref. SBDS018 2,100 USD 7C46 quartz
Darth Tuna, ref. SBBN011 2,000 USD 7C46 quartz
Arnie, ref. H558-5000 1,100 USD H558 quartz
Solar Arnie, ref. SNJ025 550 USD H851 quartz

The Grandfather Tuna and Its Grandchildren

Many collectors consider the Grandfather Tuna ref. 6159-7010 their personal holy grail. This timepiece debuted in 1975 and was sold outside of Japan under the reference numbers 6159-7009 and 6159-7019. Seiko created this watch to serve as a tool for professional divers. They were also the first manufacturer to craft a diving watch out of titanium. This light yet robust material is used for both the inner case as well as the massive outer shell, which is coated in scratch-resistant black ceramic.

The final 51-mm watch is water-resistant to 600 m (60 bar, 1,969 ft) and suitable for saturation diving. Instead of using a conventional helium escape valve, Seiko turned to their proprietary L-shaped glass seal. Unlike rubber seals, Seiko's version prevents helium molecules from entering the watch in the first place. This means the glass won't pop out during decompression as a result of helium trying to escape.

As a professional diving watch, the Grandfather Tuna has large, easy-to-read indices and hands that are coated with a generous amount of luminous material. Other features include a unidirectional diving bezel, a date display at 3, and a crown at 4 o'clock. The high-beat caliber 6159A ticks away inside this timepiece at a rate of 36,000 alternations per hour (A/h). Expect to pay around 7,100 USD for this watch.

If the Grandfather Tuna costs a bit too much for you, there are a number of good and affordable alternatives. These include the Emperor Tuna SBDX011 from 2009, as well as the Emperor Tuna Rose Gold SBDX014 and the new Emperor Tuna SBDX013 from 2015. All three share their case design with the original and are also made of titanium. However, unlike their famous predecessor, these models are water-resistant to 1,000 m (100 bar, 3,280 ft) and powered by the automatic caliber 8L35. This movement has a balance frequency of 28,800 A/h and is based on the Grand Seiko caliber 9S55. You'll find these timepieces in the Marinemaster collection. Never-worn editions sell for between 2,400 and 3,600 USD, while pre-owned pieces change hands for as little as 2,200 USD.


Prices for the Golden Tuna and Darth Tuna

Golden Tuna watches are direct descendants of the Grandfather Tuna. These models set themselves apart with their golden inner case, bezel, and crown. Their golden hue comes from a layer of titanium nitride (or TiN). The earliest Golden Tuna model premiered in 1978. It has the reference number 7549-7009 and is water-resistant to 600 m (60 bar, 1,969 ft). The quartz caliber 7549 powers this timepiece and provides it with a day-date display at 3 o'clock. You can call this watch your own for roughly 1,600 USD.

At 2,100 USD, the Golden Tuna SBDS018 from 1986 is slightly more expensive. However, the price increase is justified by this timepiece's 1,000 m (100 bar, 3,280 ft) of water resistance and more modern quartz caliber 7C46. Seiko re-released this watch in 1999 under the reference number SSBS018. Both models are nearly identical but for a few minor differences on the dial and the text on the case back.

Known as Darth Tuna, the ref. SBBN011 also gets its power from the caliber 7C46 and can survive depths of up to 1,000 m (100 bar, 3,280 ft). Instead of a golden layer of TiN, Seiko coats this watch in a layer of black DLC. This solid-black color scheme reminded Seiko's fan community of Star Wars villain Darth Vader, and the moniker quickly stuck. Prices for well-maintained pieces range from 1,300 to 2,000 USD.


Buying the Tuna with a Spring Drive Caliber

In recent decades, Seiko has earned a reputation as a pioneer of new caliber technologies. One of the most notable examples of this is the Spring Drive. These movements combine the best of mechanical and electronic watchmaking. The easiest way to identify one of these movements is the extremely fluid glide of the second hand around the dial.

One of these movements, namely the 5R65 with a 72-hour power reserve, made its way into the Marinemaster collection in 2013. It appears in the SBDB008 or, as fans call it, the Spring Drive Tuna. Seiko only produced 300 copies of this watch. It is water-resistant to 600 m (60 bar, 1,969 ft) and has the same golden TiN-coated inner case as the Golden Tuna. The outer shell is covered in a layer of gray DLC. Interestingly, the inner case of this watch isn't one solid piece like the other Tuna models. Instead, it has a screw-down case back. Thanks to its Spring Drive caliber, this timepiece also has a power reserve indicator on its dial at 9 o'clock.

Plan to spend around 4,400 USD on this rare collector's item. Alternatively, you may also enjoy the SBDB009 from 2014. This model has the same technology as the limited edition but is in series production and has a solid black color scheme. Prices for this model sit at about 3,800 USD.


An Affordable Alternative: The Seiko Arnie

In the early 1980s, Seiko produced several affordable alternatives to the Tuna. One such timepiece bears the reference number H558-5000. This watch is often called "Arnie" since none other than Arnold Schwarzenegger himself wore one of these timepieces in multiple movies, including Predator, Running Man, and Twins.

"Arnie" follows the same basic design principles as the Tuna but has a much smaller 45-mm case. It also has a stainless steel inner case and a plastic outer shell. The quartz caliber H558 ticks away inside this timepiece and lends it both an analog time display as well as a digital LCD one. The digital portion can also serve as an alarm, chronograph, or GMT display. The Seiko H558-5000 Arnie is beloved among collectors and requires an investment of roughly 1,100 USD.

Seiko announced an updated version of the Arnie at Baselworld 2019: the Prospex SNJ025 Solar . The quartz caliber H851 boasts the same functionality as the original Arnie but gets its power from the sun. What's more, the case has grown slightly to 48 mm in diameter. At only 550 USD new, this watch is among the most affordable members of the Tuna family.


The Origin of the Seiko Tuna

In 1968, Seiko received a letter from a professional diver. In it, he explained that the manufacturer's watches weren't suited for the extreme conditions experienced deep under water. He described how his watches broke either under high pressure or as helium tried to escape during decompression.

Seiko took the letter seriously and gathered a team to develop a proper professional diving watch. Almost seven years and 20 patents later, lead developer Ikuo Tokunaga presented the Tuna to the world. It was a tool watch in every sense of the term and was fit for saturation diving despite its lack of a helium escape valve.