Key Design Features
Dial: Deep green horizontal striped dial with open-heart aperture
Open-heart: Positioned around 9 o’clock, exposing the balance wheel
Indices: Applied silver baton hour markers
Hands: Polished silver baton hands with lume
Seconds hand: Slim central seconds
Date window: None
Logo: Seiko at 12 o’clock
Bezel: Rounded octagonal stainless-steel bezel, brushed finish
Bracelet: Integrated stainless-steel bracelet with brushed links and polished center accents
Case & Build
Case size: ~39–41 mm
Thickness: ~11–12 mm (slightly thicker due to open-heart movement)
Material: 316L stainless steel
Finish: Predominantly brushed with subtle polished chamfers
Crown: Push-pull crown
Caseback: Exhibition caseback (display back)
Movement
Movement: Seiko NH38 automatic (open-heart variant)
Functions:
– Hours
– Minutes
– Central seconds
Hacking: Yes
Hand-winding: Yes
Power reserve: ~41 hours
Frequency: 21,600 bph (3 Hz)
Crystal & Resistance
Crystal: Sapphire crystal
Water resistance: 10 ATM (100 m)
