Description
SEIKO 5 Sports SRPM09 Specifications
| Features |
| |||
|---|---|---|---|---|
| Driving system | Automatic with manual winding | |||
| Caliber number | 4R36 | |||
| Case material | Stainless steel | |||
| Case back | See-through screw | |||
| Case color | Silver tone | |||
| Band type | Bracelet | |||
| Band material | Stainless steel | |||
| Band color | Silver tone | |||
| Band width | 20 mm | |||
| Clasp | Three-fold with secure lock and push button release | |||
| Dial color | Green semi transparent | |||
| Glass material | Hardlex | |||
| Hands | Luminous silver tone hour, minute with orange second hand | |||
| Dial markers | Silver tone batons indexes with double triangle indexes at 12 o’clock position | |||
| Second markers | Minutes markers around the outer rim with arabic numerals per 5 minutes scale | |||
| Lumi Brite | Hands and indexes | |||
| Bezel | Fixed silver tone stainless steel | |||
| Crown | Push-pull out at 3 o’clock position with HUF logo | |||
| Calendar | Day and date display at the 3 o’clock position | |||
| Function | Date, hour, minute, second, stop seconds hand | |||
| Drive duration | Power reserve approximately 41 hours | |||
| Magnetic resistance | 4,800 A/m | |||
| Water resistance | 10 bar water resistance (100 meters / 330 feet) | |||
| Vibrations | 21,600 vibrations per hour (6 beats per second) | |||
| Size | Diameter 39.4 mm x Thickness 11.6 mm | |||
| Lug to lug | 48.1 mm | |||
| Bracelet length | 210 mm | |||
| Weight | 146 g |
SEIKO 5 Sports SRPM09 Features
Seiko 5 Sports introduces a limited-edition collaboration model with HUF.
Based on an archival Seiko model from the 1970s, affectionately known as the “Time Sonar,” this special timepiece has been reimagined with HUF’s unique style and finished with exclusive design elements.
Founded in 2002 by professional skateboarder Keith Hufnagel, HUF is a lifestyle brand rooted in the spirit of skateboarding and street culture.
Originally launched as a shop with a curated mix of brands, HUF evolved into a full-fledged label expressing its founder’s vision of skateboarding and street culture. Today, HUF has grown into a highly respected lifestyle brand, earning recognition across a wide range of fields.
Since its founding, HUF has advanced the innovative vision of Keith Hufnagel, consistently delivering a clean aesthetic, bold design, and high-quality craftsmanship.
Based on the Seiko 5 Sports Field series with a “HUF Green” color.
The semi-transparent dial features the vibrant “HUF Green,” a color that symbolizes HUF’s philosophy.
This exclusive colorway did not exist on the original archival model, making it a unique expression created specifically for this collaboration.
The ”huf” logo is placed at the 6 o’clock position on the dial.
Special case back
The exhibition case back features the same “HUF Green” as the dial and is decorated with a graphic inspired by San Francisco, the city where HUF was founded.
As a mark of exclusivity, “LIMITED EDITION” and an individual serial number are engraved on the case back.
This creation is presented in a special stainless steel box.

An original watch cloth is also included.
This watch is the second global limited edition collaboration between Seiko 5 Sports and HUF, the popular skateboarding and streetwear fashion and lifestyle brand.
HUF was founded in San Francisco by Keith Hufnagel, an ex-skateboarder from New York City, with a view to represent the international skate scene through a wide, but inclusive variety of cultures, ideas, designs, competitions and collaborations.
In a Field series-style case, the watch reflects HUF’s philosophy of rethinking and remixing vintage styles by paying tribute to skeleton dials from the 70s. It features the HUF logo at the 6 o’clock position on the ‘HUF-green’ dial. It comes in a special limited edition box, with a novelty item gift for the collaboration.
Seiko 5 Sports is known for over fifty years of reliability, durability, performance and value. ‘’5’’ represents the original five key features of every Seiko 5 still present today: Automatic movement, Day-date display, Water Resistance, Recessed crown and Durable case and bracelet.
*In an actual product, the case back direction might be different from the photograph.
- Calendar day and date display
- LIMITED EDITION on the case back
- Serial number engraved on the case back
- See-through and screw case back
- Fixed stainless steel bezel
- Three-fold clasp with secure lock
- 24 jewels
- Stop second hand function
About Seiko 5
Seiko 5. Bold designs that speak volumes about those who dare to wear the Seiko 5. The inspiration lies in the edgy designs and dramatic colours, that come together with an innovative automatic movement that defines the very spirit of a Seiko 5.
From the very start, Seiko 5 was a watch whose performance would serve the demanding needs of the new 1960’s generation, who cared less for tradition and more about life. The watch had five key attributes :
1. Automatic winding
2. Day/date displayed in a single window
3. Water resistance
4. Recessed crown at the 4 o’clock position
5. Durable case and bracelet
The technology behind the legend
From the start, Seiko 5 was designed to break the mold of watch performance and to bring to the young 1960’s generation a watch that belonged to their age and that fitted into their lives. As perhaps never before, young people of the day saw no limits to their aspirations. Seiko 5 needed to be a watch that could go anywhere and everywhere. The first challenge was durability. To be durable, a watch needs to be impervious to two threats; water and shock.
Water resistance was built in as standard to every Seiko 5 watch, and metal bracelets were used so that, from buckle to buckle, the watch was resistant to water and sweat. Shock resistance was assured with two Seiko inventions. First, the mainspring was made from “Diaflex,” an unbreakable alloy, and the “Diashock,” system was created to protect the movement from shock within the case.
Legibility was the next vital attribute. Today, we take for granted that day and date are presented in a single window but, in fact, this was an idea built in to Seiko 5 to enhance the legibility of the dial. The genius create a unique system that allowed both day and date to be shown in one plane.
The final challenge was to create a distinctive look that defined the brand. Thanks to the extraordinary Seiko invention of the ‘Magic Lever,’ the winding efficiency of Seiko 5 is very high, and the wearer rarely needs to use the crown. So the designers made it smaller and hid it under the lip of the case at 4 o’clock, giving Seiko 5 its signature look.
History of Seiko 5
Seiko began producing its Seiko 5 line of automatic watches back in 1963. Since then watch enthusiasts around the world have come to recognize Seiko 5 as reliable, affordable and well respected watches. Over the last 50 years Seiko has produced thousands of different models in the line.
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.




























