Description
SEIKO Prospex SPB321 Specifications
| Feature |
| |||
|---|---|---|---|---|
| Driving system | Automatic with manual winding mechanism | |||
| Caliber Number | 6R35 | |||
| Case material | Stainless steel with super hard coating | |||
| Case back | Solid | |||
| Band type | Bracelet | |||
| Band material | Stainless steel | |||
| Band color | Silver tone | |||
| Band width | 20 mm | |||
| Clasp | Three fold with push button release | |||
| Dial color | Gradient blue with wave shaped micro pattern | |||
| Glass material | Sapphire crystal | |||
| Glass coating | Anti-reflective coating on inner surface | |||
| Hands | Luminous grey and silver tone hour, minute and second hand | |||
| Dial markers | Grey silver tone dots indexes with batons indexes at 3, 6, 9 o’clock and double trapezoid indexes at 12 o’clock | |||
| Second markers | Minutes markers around the outer rim | |||
| Lumi Brite | Hands, indexes and bezel | |||
| Bezel | Unidirectional rotating blue glossy ceramic with silver tone 60 minutes arabic numerals minutes markers per 10 minutes diving scale | |||
| Crown | Screw down at 4 o’clock position | |||
| Calendar | Date display at 3 o’clock position | |||
| Function | Date, hour, minute, stop seconds hand | |||
| Accuracy | -15 to +25 seconds per day (when static) at normal temperature range (5°C and 35°C) | |||
| Vibration | 21,600 vibrations per hour (6 beats per second) | |||
| Drive duration | Power reserve approximately 70 hours | |||
| Magnetic reluctance | Magnetic resistance 4,800 A/m | |||
| Water resistance | 200 m water resistance suitable for air diving | |||
| Size | Diameter : 45 mm x Thickness : 13.4 mm | |||
| Lug to lug | 52.6 mm | |||
| Weight | 190 g |
SEIKO Prospex SPB321 Features
Seiko Prospex Automatic Diver’s Watch Re-Interpretation
Designed for those who treat life as the ultimate adventure, the Seiko Prospex line meets every challenge with technological excellence and style. Part of a rich legacy of innovation in high-intensity timekeeping, Prospex continues to celebrate a long history of sports watch excellence with recreations and reinterpretations of landmark achievements. Based on an iconic Seiko design, with upgraded materials, this automatic diver’s watch is crafted of stainless steel with durable super-hard coating, and offers a blue uni-directional rotating elapsed timing bezel in scratch-resistant ceramic, a sapphire crystal with anti-reflective coating on the inner surface, a screw down crown and case back, and a tri-fold clasp with push-button release, secure lock and extender. The distinctive press-patterned gradated blue dial features a date calendar and LumiBrite hands and markers. Following ISO standards for scuba diving to depths of up to 200 meters, this exceptional timepiece includes a 24-jewel automatic movement with a frequency of 21,600 vibrations per hour, a power reserve of approximately 70 hours, and manual winding capability. 200m Water Resistant
- Date display
- 24 jewels
- Unidirectional rotating bezel
- Screw case back
- Screw-down crown
- Three-fold clasp with secure lock
- Unidirectional rotating bezel
- Stop seconds hand function
About Seiko Prospex Sea Diver SPB321
As a culmination of Seiko’s developments in watchmaking technology, today, a diver’s watch in a stainless steel case with green dial offering water-resistance of up to 200m is introduced.
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 SPB321
When Kintaro Hattori founded his company in 1881, he was just 21 years old. During his fifty years at the helm, Seiko became the leading watch company in Japan, with its own design and production facilities. This achievement was a direct result of his single-minded vision that Seiko should be “Always one step ahead of the rest”. His words resonate still and continue to inspire Seiko today. Throughout this year, Seiko will release a series of creations that embody the spirit of Kintaro’s words and honor the140th anniversary of the founding of his company. The celebrations start with a series of Prospex, Presage and Astron watches inspired by the landscapes, seascapes of Japan.
From Seiko Prospex, a new series focuses on the beauty of nature. The watches capture the deep green scenery of the rich ocean that surrounds Iriomote Island.
The island of Iriomote in Okinawa Prefecture attracts divers from all areas of the world. Its abundant coral reefs teem with marine life but the island’s special charm lies in the primeval and pristine mangrove forests that surround it. Further, Iriomote is home to several species of flora and fauna that are rare and, in some instances, unique to the island.
Progression of Seiko Prospex Sea Diver
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.
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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
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.
