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If you like watches, you will surely have heard about Seiko Sumo watches. Belonging to the Prospex family, it is a mid-range automatic diving watch that enjoys fame and recognition of much more valuable pieces.

It is a battle watch, water resistant to 200 meters and with ISO 6425 certificate, but with an appearance closer to the expensive Marine Master series. From the hand of Laguarda Joiers, the best online watchmaking in Barcelona, we will know the reason for the fame of these Seiko watches.

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Seiko Sumo Watches: Technical Specifications

  • Origin: Japanese
  • Crystal Type: Hardlex Crystal
  • Visualization: Analog with fluorescent lumens on needles and markers
  • Case material: Stainless Steel
  • Belt material: Plastic resin or Steel, depending on the model
  • Diameter: 45mm
  • Thickness 13.3 mm
  • Belt Width: 20mm
  • Weight: 183 grams
  • Mechanism: Automatic movement
  • Caliber: Seiko 6R15
  • Caliber features: 23 jewels with 21,600 bph, 50-hour power reserve, second stop and manual winding
  • Accuracy: -15 / + 25 seconds / day
  • Water resistance: 200 m / 20 ATM (ISO 6425 Certificate)
  • Bezel: Unidirectional rotating bezel
  • Other features: Screw-down crown and screw back cover
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Common features of Seiko Sumo

The first Seiko watches of the Sumo range were released in 2007 with the first Seiko Sumo, launched in three versions: SBDC 001 (black dial), blue dial SBDC 003 and SBDC 005 with its striking orange dial.

Later years, 7 more limited versions would appear: (SBDC027, SZSC004, SBDC017, SPB055J, SPB029, SPB031, SBDC049), some of them with notable improvements such as sapphire crystal and the expected Pepsi version (SBDC057).

Seiko Sumo watches are especially robust, designed for hard work such as scuba diving, while maintaining a certain classic elegance.

It retains a more conservative design than that of its cousin, the Turtle but more rounded in the style of the Marine Master.

Likewise, it has a more advanced mechanism than Prosxpex watches.

Seiko Sumo design

The Box

With its 45 mm diameter and 13.3 thickness, Seiko Sumo watches are blunt diving watches, whose case has been designed to look wide and large on the wrist.

The lugs in addition to being curved include holes on the outside to facilitate the change of straps, which is appreciated.

The crown

The screwed crown follows the trend of Prospex divers and stands at 4 o’clock to interfere as little as possible with the play of the wrist.

It has a simple grip thanks to its deep grooves and is engraved with an “S” on its polished top, possibly the initial one of Seiko.

The glass

Except for some special editions that feature sapphire crystal, all Seiko Sumo watches mount a hardlex crystal. A type of hardened mineral crystal owned by Seiko, somewhat more scratch resistant than traditional mineral glass, but not as hard as sapphire crystal.

Dial and needles

The dial follows the Prospex line, with large hour markers that are very visible and full of long-lasting lumens to improve the visibility of underwater divers.

The bezel

Seiko Sumo watches have a 120-click unidirectional bezel made of aluminum, with large numbers printed to maximize visibility.

Caliber and operation

One of its main attractions is its improved and more modern Seiko 6R15 caliber. An automatic movement of 23 rubies and 21,600 beats per hour, with power reserve of up to 50 hours.

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Seiko watches in Laguarda Joiers

To buy Seiko watches online, especially if you are interested in the Seiko Sumo range, do not hesitate to visit the Laguarda Joiers website, the best online watchmaking in Barcelona.

Nicola Picasso, padre y marido enamorado es un apasionado del deporte, especialmente del trail running. Atleta X-Bionic, Tailwind Trailblazer y Bamboolabs Ambassador, ha hecho de su afición por correr toda una aventura que trasciende las redes sociales.