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Seiko Sea horse Automatic J13056, 1964


Beautiful vintage automatic Seiko Sea horse from 1964 in good overall condition. New leather strap.

Watch serviced (01/2023) and cleaned.

1 year warranty.

Out of stock


Gorgeous black Seiko Sea horse automatic from 1964, fitted with a Seikosha 2451 Sportsmatic movement. The watch is in good overall condition.

This Sea horse is in its original condition, rare black dial, dauphine hands and gorgeous half brushed half shiny steel hour markers, all in very good condition. The 37 mm wide J13056 case is in good condition, with some normal minor wear, as is the acrylic crystal.

The movement is a Seikosha 17-jewel automatic 2451. It has been serviced, it works great, holding good time (gaining about 10 s a day), the balance having an good amplitude.
New brown leather band.
Vintage watch without known history but checked, serviced (01/2022) and cleaned. Water resistance non tested.

The pictures are actual and are part of the description, so please look carefully at them.


Additional information

Weight 0.15 kg


movement type





Case material

Stainless steel


Lug width

19 mm


Dress watch, Sports

Year of manufacture

The brand

Introducing Seiko would be useless, it is the most important manufacturer in the world. Founded 120 years ago, it really begun to be a leader in the 60’s/70’s thanks to their automatic watches and of course with their quartz models.
Seiko invented many concepts (analogic and LCD quartz, Kinetic watches, Spring Drive, etc) and marketed all sorts of designs. Its range of watches is incredibly wide, answering almost all budget, design or quality questions.

The range

Sportsmatic is an entry level automatic watches range introduced by Seiko in the early 60’s. Entry level won’t mean that these watches were of low quality, some of them were even very well built compared to models from other manufacturers.

The first Sportmatics were time only (Seikosha 2451 movement) or date only watches (Seikosha 820 movement).  In 1963-1964, Seiko marketed its first day/date calibre, the Seikosha 410 and fitted it in the first Seiko 5 Sportsmatic. These first “5” had a chromed case (the latter ones had a stainless steel case) and no date quickset.

In 1964, Seiko launched the 5 Sportsmatic Deluxe, which was an enhanced version of the 5 Sportsmatic. All the Deluxe had a stainless steel case and a dedicated pusher to set the date. At that time, Seiko modified its way to name their movements and adopted a 4-digit naming convention.

From 1964 to 1967-68, Seiko produced quite a lot of Sportsmatic models and we can sum up the production like this :

  • Sportsmatic “time-only”, 6601 movement (ex 2451)
  • Sportsmatic Calendar 820, 7625 movement (ex 820)
  • Sportsmatic Deluxe, 7605 movement
  • 5 Sportsmatic, 6619 movement (ex 410)
  • 5 Sportsmatic Deluxe, 7606 and 7619 movement

Some models were unusual, for example the Sportsmatic “SilverWave”, water resistant with a screwed crown.
The very last Sportsmatics only had their name engraved on the case back, with a 7625 calibre (1968).

You can read this interesting article on the Sportsmatic, on the Ginza Seiko Museum website.


You have a right to cancel an order during the period of 14 days following the date of the order (and this for any reason).

This watch has a 1 year guarantee.

Please read the details about the Right to Cancel and the Guarantee in our Terms of Sales.

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