SEIKO PROSPEX SRP639K1

Original SEIKO
Grs 1th SEIKO

Specifications:
* Driving system: Automatic winding type with manual winding mechanism
* Caliber No. 4R36
* Power reserve: 41 hours
* Accuracy: +45 / -35 seconds per day
* Stainless steel case
* Screw caseback with tsunami divers logo
* Hardlex Crystal Glass
* Black Dial color
* Band : Black Urethane
* Buckle : Normal Tang
* LumiBrite Hands and Markers
* Day & Date Display at the 3 O'clock
* Water resistant 200M / 20 ATM Diver Certified
* Case diameter: 46.4 mm (without crown), 50 mm (with crown)
* Case thickness: 15 mm
* Band width: 22 mm
* Max wrist size: 8.75 inch
* Remark:
- 21,600 vibrations per hour
- 24 jewels
- Unidirectional rotating stainless steel with carbon-titanium coating
- Screw-down Crown