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Seiko Tuna

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Seiko Prospex 48mm Black Australia, Keysborough
Seiko Prospex Tuna Violet Ocean 1000m SBBN042 LE
AU$ 4,250
Verified Dealer
6
AU
Seiko Monster Australia, Kingsdene
Seiko Monster SRP453 Baby Tuna Blue Limited Edition Mens Watch
AU$ 1,200
Verified Dealer
23
AU
Seiko Titanium 49mm Black No numerals
Seiko Golden Tuna 7c46 7009
AU$ 3,088
Verified Dealer
427
ES
Seiko Titanium 50mm
Seiko Professional 600M Diver Tuna Can 6159-7010
AU$ 6,209
Verified Dealer
107
JP
Seiko Marinemaster Steel 48mm
Seiko Marinemaster 300 Tuna SBBN031 Diashield
AU$ 2,695
Verified Dealer
302
DE
Seiko Marinemaster Titanium
Seiko Prospex Marine Master SBDB008 5R65 100th anniversary
AU$ 6,871
Free shipping
Verified Dealer
218
JP
Seiko Prospex Steel
Seiko eiko Men PROSPEX Tuna Diver's SRPA99K1 Limited Edition 1881
AU$ 1,932
Free shipping
Verified Dealer
MY
Seiko Titanium 50mm Black
Seiko "Platinum Tuna" MM1000 SBBN029 on metal (RARE)
AU$ 4,481
Verified Dealer
9
US
Seiko Marinemaster
Seiko Marinemaster
AU$ 4,164
Verified Dealer
638
US
Seiko Marinemaster Ceramic 48mm Black
Seiko Marine Master Automatic Professional "Emperor Tuna" -...
AU$ 6,175
Verified Dealer
47
MC
Seiko Prospex Steel 50.2mm Blue Australia, Kingsdene
Seiko Prospex Baby Tuna Automatic 50th Anniversary 200M Sport...
AU$ 760
Verified Dealer
23
AU
Seiko Marinemaster
Seiko Tuna Marinemaster 300
AU$ 1,836
Private Seller
 
HU
Seiko Prospex Titanium 52.4mm
Seiko Prospex Tuna SBDX029
AU$ 4,898
Verified Dealer
107
JP
Seiko Steel 48mm
Seiko Diver (Darth Tuna) steel/ceramic/titan
AU$ 2,732
Verified Dealer
302
DE
Seiko Marinemaster Titanium
Seiko Marinemaster Prospex Professional 1000m 8L35-00H0 Automatic
AU$ 3,422
Free shipping
Verified Dealer
218
JP
Seiko Steel
Seiko Prospex Tuna Solar Diver's 200M SNE498P1 Gents Black
AU$ 541
Free shipping
Verified Dealer
MY
Seiko Titanium 50mm Black
Seiko Platinum Tuna "MM1000" SBBN029 on grey leather (RARE)
AU$ 4,790
Verified Dealer
9
US
Seiko Marinemaster
Seiko Marine Master Professional SBBN027 - SBBN027
AU$ 3,245
Verified Dealer
638
US
Seiko Marinemaster Titanium 49.4mm Black
Seiko Prospex Marine Master Professional SBBN025
AU$ 2,348
Verified Dealer
 
JP
Seiko Prospex Australia, Kingsdene
Seiko Prospex Diver SNE518 SBDJ045 Save the Ocean Tuna Special...
AU$ 690
Verified Dealer
23
AU
Seiko Prospex 46.5mm
Seiko sne499p1 Solar.....Prospex...Tuna (PADI)
AU$ 499
Private Seller
 
DE
Seiko Prospex Titanium 45mm Black
Seiko セイコー プロスペックス マリーンマスター プロフェッショナル
AU$ 1,766
Verified Dealer
136
JP
Seiko Marinemaster Titanium 48mm Black
Seiko Marinemaster
AU$ 5,843
Verified Dealer
1279
SE
Seiko Prospex
Seiko PROSPEX BABY TUNA SRP637 NEW
AU$ 889
Free shipping
Verified Dealer
61
US
Seiko Prospex Steel
Seiko PROSPEX SRPD14K Gold Fin Tuna Limited Edition 2200pcs
AU$ 1,159
Free shipping
Verified Dealer
MY
Seiko Prospex Steel 53,5mm Green No numerals
Seiko SBDX027 GUNDAM EMPEROR TUNA Prospex Limited Edition
AU$ 6,140
Free shipping
Verified Dealer
32
JP
Seiko Marinemaster
Seiko Marinemaster
AU$ 4,906
Verified Dealer
638
US
Seiko Prospex Steel 47mm Black No numerals
Seiko International Edition Prospex Auto Baby Tuna SRP639K1
AU$ 926
Free shipping
Verified Dealer
107
SG
Seiko Prospex Steel 51.7mm Blue Australia, Kingsdene
Seiko PROSPEX MONSTER TUNA PADI SRPA83 LIMITED SPECIAL...
AU$ 760
Verified Dealer
AU
Seiko 48mm
Seiko Divers Professional 600m Golden TUNA
AU$ 2,996
Private Seller
 
ES
Seiko Marinemaster Steel Black
Seiko Prospex SBBN033 Tuna Can Quartz 300m Diver
AU$ 1,262
Verified Dealer
360
JP
Seiko Marinemaster Black
Seiko Marine Master Professional SBDX013 - SBDX013
AU$ 4,325
Verified Dealer
170
HK
Seiko Prospex Steel 48mm Black
Seiko Prospex Automatic Divers 200M Yellow Fin Baby Tuna
AU$ 529
Verified Dealer
191
SG
Seiko Marinemaster Steel 55mm Black
Seiko Divers
AU$ 3,187
Verified Dealer
88
JP
Seiko Prospex Steel Black
Seiko Prospex Solar "Tuna" Dive Watch SNE497
AU$ 617
Free shipping
Verified Dealer
61
US
Seiko Prospex
Seiko Prospex Darth Tuna
AU$ 3,168
Verified Dealer
638
US
Seiko Marinemaster Steel Black No numerals
Seiko Japan Edition Prospex MarineMaster Spring Drive SBDB013
AU$ 6,179
Free shipping
Verified Dealer
107
SG
Seiko Prospex 46.7mm Black Australia, Kingsdene
Seiko Prospex Solar Tuna SNE497 SNE497P1 Divers 1978 Reedition...
AU$ 550
Verified Dealer
23
AU
Seiko Prospex 46.5mm
Seiko SNE518p1 Prospex..Solar...Tuna...(Save the Ocean)
AU$ 516
Private Seller
 
DE
Seiko Marinemaster Steel
Seiko Prospex SBBN031 Tuna Can Quartz 300m Diver
AU$ 1,473
Verified Dealer
360
JP
Seiko Marinemaster
Seiko Prospex Sea Marine Master SBBN025 - SBBN025
AU$ 2,659
Verified Dealer
170
HK
Seiko Marinemaster Titanium 49,4mm Black No numerals
Seiko SBBN027 Marinemaster Professional Prospex 1.000 m.
AU$ 2,622
Free shipping
Verified Dealer
32
JP
Seiko Marinemaster Titanium 52mm Black
Seiko Marinemaster Professional 1000m Diver TUNA Emperor
AU$ 4,823
Verified Dealer
123
AT
Seiko Marinemaster Titanium 53mm Black
Seiko Marinemaster Prospex 1000m Automatic
AU$ 3,587
Verified Dealer
601
DE
Seiko Marinemaster Steel 47,5mm Black No numerals
Seiko “Tuna” Marinemaster SSBN031
AU$ 2,504
Private Seller
 
ES
Seiko Prospex
Seiko New Seiko SRP641K1 Prospex Automatic Baby Tuna Diver's 200M
AU$ 701
Private Seller
 
ES
Seiko Prospex Steel 48mm Black Australia, Kingsdene
Seiko PROSPEX SRP641 Baby Tuna Automatic Scuba Divers Rubber...
AU$ 448
Verified Dealer
AU
Seiko Prospex Steel 46mm Black No numerals
Seiko Prospex 200m Solar Diver Tuna Limited Edition
AU$ 583
Private Seller
 
CA
Seiko Steel 47mm Black No numerals
Seiko Tuna SNE498 + Nato straps
AU$ 541
Private Seller
 
CA
Seiko Marinemaster Titanium 53.5mm Black No numerals
Seiko Prospex Marine Master SBDX014 (New)
AU$ 5,872
Private Seller
 
HK
Seiko Marinemaster Titanium 49mm Black
Seiko Marinemaster
AU$ 1,819
Private Seller
 
IT
Seiko 49mm
Seiko Golden Tuna 7549-7000 JDM Version - 1978 Original
AU$ 3,505
Private Seller
 
NL
Seiko Marinemaster Titanium 52mm Black No numerals
Seiko Marinemaster
AU$ 4,192
Private Seller
 
SG
Seiko Marinemaster Titanium 53mmmm Black No numerals
TOP
Seiko Marinemaster
AU$ 3,392
Private Seller
MY
Seiko Prospex Steel 50mm Blue No numerals
Seiko 50th Anniversary Special Edition Baby Tuna
AU$ 804
Private Seller
 
CY
Seiko Prospex Steel 51.7mm Australia, Kingsdene
Seiko SRPA79 SRPA79J PROSPEX JAPAN BABY TUNA Automatic SILVER...
AU$ 5,198
Verified Dealer
AU
Seiko Prospex Steel 50.2mm Blue No numerals
Seiko Japan Edition Prospex Automatic Tuna Baby SBDY055
AU$ 2,007
Free shipping
Verified Dealer
107
SG
Seiko Steel 51mm White No numerals
Seiko SBDY053 Frosty baby TUNA
AU$ 974
Free shipping
Verified Dealer
32
JP
Seiko Marinemaster Titanium Black
Seiko Prospex SBDB013 Tuna Can Spring Drive 600m Diver
AU$ 3,997
Verified Dealer
360
JP
Seiko Marinemaster
Seiko Prospex Marine Master Professional - SBDB013
AU$ 4,147
Verified Dealer
170
HK
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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.