Seiko Seigaiha: '青海波' Brushed Black

A distinctive custom build combining the traditional Japanese Seigaiha wave pattern with the sporty character of a Yachtmaster-inspired design.

At the heart of the build is a custom Seigaiha dial with BGW9 lume, paired with polished silver Mercedes-style hands featuring matching BGW9 lume. The monochromatic black and silver combination creates a clean, understated contrast while allowing the intricate wave pattern of the dial to remain the focal point.

A black Yachtmaster ceramic bezel insert surrounds the flat sapphire crystal, complementing the brushed and polished black case. Powering the watch is the reliable Seiko NH35A automatic movement, featuring a white date wheel with black numerals.

The build is finished with a black curved-end rubber strap and black deployant clasp, completing the stealth-inspired aesthetic.

Watch Specifications

Case: Brushed/Polished Black Case
Dial: Custom Seigaiha Dial – BGW9 Lume
Crown: Polished Black Screw-Down Crown
Date Wheel: White Date Wheel with Black Numerals
Caseback: Brushed/Polished Black Exhibition Caseback
Bezel Insert: Black Yachtmaster Ceramic Bezel Insert
Crystal: Flat Sapphire Crystal – No AR
Movement: Seiko NH35A (TMI) Automatic Movement
Hands: Polished Silver Mercedes Handset – BGW9 Lume
Bracelet / Strap: Black Curved-End Rubber Strap with Black Deployant Clasp
Water Resistance: 10 BAR / 100 metres

Dimensions

Case Diameter: 40mm
Lug-to-Lug: 48.4mm
Thickness: 13.25mm
Lug Width: 20mm