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Marine Master Pro. 600M Springdrive Tuna Ref. SBDB013

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Seiko Tuna is the name given to Seiko's range of watches designed for scuba and professional diving. In particular, Seiko made these watches with saturation diving or greater depth diving in mind. All of the watches in the Seiko Tuna range are characterized by protective screwed-on shrouds that have earned them the nickname of “Tuna”.

SBDB013 with 5R65 Springdrive Movement & Power Reserve Indicator

The Seiko Tuna collection boasts of many firsts. The collection was the first to feature a titanium/stainless steel shroud, a monocoque case, an L-shaped gasket, and a vented rubber strap. Primarily built for functionality, the Seiko Tuna watches can withstand great depths as tools for professional divers.

Built in 1975, the first Seiko Tuna watch was created in response to a letter the company received in 1968. A saturation diver from Kure City in the Hiroshima, Japan sent a complaint regarding Seiko divers watches, which the company had been making since 1965. These pre-Tuna models were not robust to impact and could not withstand exposure to deep underwater pressure for prolonged periods.

Seiko engineers took on the challenge to create the “ultimate professional diver’s watch. These engineers, led by Ikuo Tokunaga, decided to develop the new Seiko Tuna watches for saturation diving from the start. Tokunaga and his team began development in 1968 and released the first Seiko Tuna watch seven years later with more than 20 patents.

DLC treated Titanium Case

Being the top of the line Prospex and arguably the second highest Seiko dive watch(first being Grand Seiko), Seiko gave it the best it had.

The Marine Master Professional 600M Springdrive Tuna Ref. SBDB013 is powered by Seiko's iconoic Springdrive movement, 5R65. The 30 jewels Springdrive movement features a power reserve of 72 hours, has a power reserve indicator and is used primarily in the Grand Seiko collection. The Springdrive is a conventional automatic movement with a few key components replaced. Namely, the functional time keeping parts are gone, which are basically the pallet fork, escape wheel, balance wheel and hairspring. Replacing them is a tri-synchro regulator which is a new way of extremely precisely controlling the amount of power coming out of the mainspring. The tri-synchro regulator converts kinetic energy from the mainspring into electrical energy, which powers a quartz crystal and an electromagnetic brake which slows the movement down in accordance with information from the quartz crystal. The result is it has the beauty of a mechanical movement, the accuracy of a quartz movement, and the smoothest seconds hand in the world.

Fine vertical satin brushed on DLC Titanium shroud

The 50mm titanium case might sound intimidating at first glance. Due to the lack of lugs in the Tuna design, the case is only 50mm lugs to lugs. That means this "Tuna" sits so comfortably on the wrist. In fact we think it fits more like a conventional 45mm watch with lugs. The DLC treated titanium case and shroud is fine satin brushed for a up-market feel. The case is probably our favourite element of the watch. We will let the pictures do the talking.

Seiko's Lumibrite needs no introduction

The dial's makers and hands are treated with Seiko's Lumibrite for awesome low light visibility. There's a lot of lume on this Tuna. Like a ton of it. Probably, the most we've ever seen on a watch.

Sapphire crystal with anti-fogging coating for added toughness.

The SBDB013 Tuna comes with a ultra soft subber strap. The lightweight of the Titanium case, the lugs-less design and the soft strap adds to the overall wearing comfort of this watch.

Maker: Seiko Japan

Movement: Caliber 5R65. Seiko Springdrive with power reserve indicator.

Accuracy: +/- 15 seconds per month.

Dial: Matte black with applied luminous indexes

Luminous: Lumibrite

Date: 4.30 O'clock

Case: High-intensity Titanium Bezel and Inner Case

Crown: Screwdown. Signed Crown

Lug: 22mm

Crystal: Sapphire with anti-fogging

Strap: Rubber

Water resistance: 600m. ISO certified.

Dimensions: 50mm in diameter, 50mm lug to lug

Power Reserve: 72 hours

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  • Marine Master Pro. 600M Springdrive Tuna Ref. SBDB013
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