The Seiko Prospex SRPH99K1 watch is part of the Black Series collection inspired by the world of night diving. The lumbrite green coloration on the indexes and on the receptacles is designed for greater visibility in all low light conditions. This watch has a shape that is nicknamed by Seiko fans a "Samurai" due to its design as if it were cut from a sword.
These watches are designed to be practical, reliable and durable in extreme or everyday environments, for experts, sports lovers and adventurers.

Movement
- Calibre: 4R35
- Movement Type: Automatic & Manual Winding
- Power Reserve: 41 Hours


Watch Case
- Case Material: Stainless steel (hard coating)
- Case Thickness: 11.72 mm
- Case Diameter: 42.4 mm
- Case Length: 45.17 mm
- Lug Width: 20 mm


Exterior
- Dial Colour: Grey
- LumiBrite: Lumibrite on hands, indexes and bezel
- Clasp: Pin buckle
- Strap/Bracelet: Polyester

Other Specifications
- Water Resistance: 20 bar
- Crystal Type: Sapphire