Description
SEIKO Prospex SPB503 Specifications
| Feature |
| |||
|---|---|---|---|---|
| Driving system | Automatic with manual winding capacity | |||
| Caliber Number | 6R55 | |||
| Case material | Stainless steel with super hard coating | |||
| Case back | Transparent | |||
| Band type | Bracelet | |||
| Band material | Stainless steel | |||
| Band color | Silver tone | |||
| Band width | 20 mm | |||
| Clasp | Three-fold with push button release | |||
| Dial color | Teal | |||
| Glass material | Sapphire crystal with magnifier | |||
| Glass coating | Anti-reflective coating on inner surface | |||
| Hands | Luminous hour, minute with white and grey colored second hand | |||
| Dial markers | Luminous grey indexes with arabic numerals at 2, 4, 6, 8, 10 and 12 o’clock position | |||
| Second markers | Minutes markers around the outer rim | |||
| Lumi Brite | Hands and indexes | |||
| Bezel | Fixed silver stainless steel with rotating compass markers around the inner rim | |||
| Crown | Screw down | |||
| Calendar | Date display at the 3 o’clock position with magnifier | |||
| Function | Date, hour, minute, second, stop second hand | |||
| Accuracy | -15 to +25 seconds per day | |||
| Drive duration | Power reserve approximately 72 hours | |||
| Magnetic reluctance | Magnetic resistance 4,800 A/m | |||
| Water resistance | 20 bar water resistance (200 meters / 660 feet) | |||
| Size | Diameter 39.5 mm x Thickness 12.7 mm | |||
| Lug to lug | 46.4 mm | |||
| Weight | 147 g |
SEIKO Prospex SPB503 Features
From the Alpinist collection, first launched in 1959, these watches were designed for Japanese ‘Yama-otoko’ mountain men, to be reliable in treacherous terrain.
Under the sapphire crystal glass, the archive-inspired teal blue dial is complemented by ‘cathedral style’ hour and minute hands, accompanied by classic Arabic numerals and wedge-shaped indices. It features the traditional Alpinist logo under the Seiko logo, which featured on the very first 1950s Laurel Alpinist. The ‘Mountain Device’ logo features on the case back of these watches, an aspect of the vintage original indicating the field nature of the watch. The case has an applied super-hard coating for increased scratch resistance and shine.
Through the exhibition case back, the in-house automatic 6R55 caliber can be viewed, accurate to -15/+25 seconds per day, with a power reserve of 72 hours.
Prospex is a combination of the words ‘Professional’ and ‘Specifications.’ Seiko Prospex timepieces are designed to be practical, reliable and durable; to meet the high standards required in extreme environments for sports lovers and adventure seekers alike.
- Date display
- Rotating compass inner ring bezel
- See-through screw case back
- Screw-down crown
- 24 jewels
- Stop second hand function
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.
