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$ 1,376

Prospex Tuna 1975 Professional Diver Black Dial Black Silicone Strap Quartz Diver 300M from Japan Domestic Market (JDM)

  • 1 year official warranty
  • Release Date : 8 August 2020
  • Made in Japan
  • Battery Powered Quartz Movement
  • Caliber 7C46
  • Stainless Steel with Super Hard Coating
  • Black Silicone Strap Material
  • Curved Sapphire Crystal with Inner Anti-Reflective Coating
  • Antimagnetic
  • Screw Case Back
  • Screw Down Crown at 4 o’clock Position
  • Unidirectional Rotating Bezel
  • 5 years battery life
  • ± 15 seconds per month Accuracy
  • 300 m Waterproof for Saturation Diving
  • H 46.7 mm x W 47.7 mm x D 14.1 mm
  • Wrist size 215 mm
  • 129 g
  • Reference : S23629 / S23629J1 / SBBN045


SEIKO Prospex S23629J1 Specifications : 

Driving systemQuartz
Caliber Number7C46
Case materialStainless steel with super hard coating
Case backSolid
Band materialSilicone
Band colorBlack
Band width22 mm
Dial colorBlack
Dial colorBlack
Glass materialCurved sapphire crystal with inner anti-reflective coating
HandsLuminous green and silver tone (hour, minute) with green, black and silver tone second hand
Dial markersLight green colored dots and triangle at 12 o’clock position
Second markersMinutes markers around the outer rim
Lumi BriteHands, indexes and bezel
BezelUnidirectional rotating stainless steel silver tone with arabic numerals minutes markers per 10 minutes scale
CrownScrew down at 4 o’clock position
CalendarDay and date display at 3 o’clock position
FunctionDay, date, hour, minute, stop second hand
Accuracy±15 seconds per month
Drive durationApproximately 5 years
Water resistance300 m / 1000 ft water resistance suitable for saturation diving
Magnetic reluctanceMagnetic resistance
FeaturesAntimagnetic, date, day, glowing hands, glowing markers, screw-down crown
SizeLength : 46.7 mm x Diameter 47.7 mm x Thickness : 14.1 mm
The perimeter of bracelet215 mm
Weight129 g

SEIKO Prospex S23629J1 Features :

The professional diver’s inspired by 1975 classic

The unique construction makes the watch virtually impermeable to helium and therefore safe for saturation diving in the harshest environments. The 1975 classic has been re-imagined in SLA042J1 with the high specifications. It is 1,000 meter water resistant, the case is titanium and the bezel is in Ever-Brilliant Steel.

  • Calendar day and date display
  • Screw case back
  • Screw down crown
  • Unidirectional rotating bezel

About Seiko Prospex Sea Diver S23629J1

From the introduction in 1965 as Japan’s first diver’s watch, the engineers never stopped to innovate. The trust this watch has gained goes beyond the borders of Japan and into the world. Because of that, Seiko facilitated the establishment of the standard for diver’s watches in International Standard Organization (ISO), and Japan Industrial Standards (JIS). As for the ISO, Seiko lobbied the organization to amend the standard to match the actual use of diver’s watches in the deep sea. In 1996, ISO6425 with annex, about diver’s watches for mixed gas diving, was issued. Moreover, Seiko’s relentless challenge and innovation have driven the company to create a model that could truly be called authentic.

Behind Seiko’s diver’s watch that has been chosen by divers world wide, there are qualified engineers who work to developed technology that the world has never seen.

First, through significant innovation, water resistance and impermeability has proven to be the finest in world class. Above all, along with functionality, using specialized material and precise detail in structure, the timepiece is made to perfection. In addition, Seiko’s determination and innovative technology resulted in many patents to preserve the company’s authenticity.

Since then, there are countless products labeled as a diver’s watch around the world but only a negligible number of these timepieces are functional in professional environments.

History of Seiko Prospex Sea Diver S23629J1

Introduced in 1965, Seiko’s innovative diver’s watch has been chosen by divers and adventurers globally. In other words, Seiko’s diving watch has become a global standard as a result 50 years of innovation.

Everything started with a letter from a professional diver in Hiroshima prefecture of Japan. However, the diver explained that in depths greater than 300 meters, when using a diving capsule and saturation diving techniques, most watches get damaged. Answering this request, Seiko established a new development team. Then after years of research development, the world’s first Professional Diver’s 600 m with titanium case was created.

In conclusion, with half a century of history and remarkable innovation, Seiko’s diver’s watch has been used all over the world in diverse situations. Therefore, over the years, the timepiece has proven itself worthy of any harsh environment and has been praised from professional divers.

Progression of Seiko Prospex Sea Diver

Seiko Prospex Sea Diver. Antarctic Team of the Geospatial Information Authority of Japan

Earning credibility through vigorous adventures in the North and South Pole.

From 1966, the timepiece has been brought on 4 missions with the Antarctic Team of the Geospatial Information Authority of Japan. Later on, numerous adventurers and explorers have made achievements such as successfully ascending Everest gearing Seiko’s diver’s watch. After years of proving itself worthy of withstanding extreme environments, Seiko’s diver’s watch has earned its integrity.

Seiko Prospex Sea Diver. Seiko Diver WatchSeiko Prospex Sea Diver. Shinkai 2000

Exceeding any expectation of water resistance with the depth of 1062 meters.

In May of 1983, two Professional Diver’s 600 meters were mounted on Shinkai 2000, a research submersible used by JAMSTEC (Japan Agency for Marine-Earth Science and Technology). The watch was originally intended for use up to 600 meters, yet the timepiece withstood water pressure at a depth of 1062 meters. As a result, the watch’s legibility, precision, and exterior remained unscathed, continuing to strengthen its credibility.

Courtesy: JAMSTEC


Seiko Prospex Sea Diver. Result of saturation driving graph
Water-Resistance:Air tightness
The result of 300m saturation diving: Pressure inside the watch case for brand other brands (A, B, C) and Seiko Professional Diver’s
The vertical line shows the pressure inside the watch case and the horizontal line indicates the period of time.
After the dive, the air pressure inside the watch case gradually went up.
Seiko Professional diver’s scored the best result and verified that it is strong enough to function even at great depths.

Proving its significant impermeability.

For saturation diver’s watches, helium is a constant issue. That is to say, the gas penetrates the glass, and in some cases the difference in external and internal air pressure causes the glass cover to break. While other companies focus on methods to release Helium with an escape valve, Seiko took a different turn and developed a glass case that is practically impermeable to Helium gas. This is the creation of Seiko’s Diver’s Professional 600M. Then, in 1983, JAMSTEC conducted an impermeability test by submersing several diver’s watches under 300M saturation diving. Consequently, Seiko’s Diver’s Professional 600M proved to be up to ten times more impermeable to Helium gas compared to other companies. In short, the true diver’s watch continues to prove itself.

Courtesy: JAMSTEC

History of Seiko

The company was founded in 1881, when Kintarō Hattori opened a watch and jewerly shop called “K. Hattori” (服部時計店 Hattori Tokeiten) in the Ginza area of Tokyo, Japan. Eleven years later, in 1892, he began to produce clocks under the name Seikosha, meaning roughly “House of Exquisite Workmanship”.

The first watches produced under the Seiko brand appeared in 1924. In 1969, Seiko introduced the Astron, the world’s first production quartz watch, it cost the same as a medium-sized car. Seiko later went on to introduce the first quartz chronograph.

Additional information

Weight1 kg
Dimensions5 × 5 × 2 cm

Service Center

Center NameAddressTelFax
Seiko Service Center JakartaJalan Melawai IX No. 46, Blok M, Jakarta Selatan, Indonesia+62-21-7208717+62-21-7201249
Seiko Service Center JakartaPlaza Senayan Lt 3 No. 353-A, Jakarta Pusat, Indonesia+62-21-5725689


Seiko Service Center JakartaLt Dasar No. 115-116, Gd. Harco Pasar Baru, Jakarta Pusat, Indonesia+62-21-3452335
Seiko Service Center SurabayaJalan Tunjungan No. 98-100, Surabaya, Indonesia+62-31-5474756


Seiko Service Center SurabayaPlaza Surabaya, Lt 1 No. 56-57, Surabaya, Indonesia+62-31-5316199
Seiko Service Center MedanJalan Cirebon No. 16, Medan, Indonesia+62-61-4149636
Seiko Service Center MedanSun Plaza Level 1, Blok C-32, Medan, Indonesia+62-61-4501505

Water Resistance

Water Resistant Chart


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