Seiko Cal. 5631 - 582

This Hand-Winding model from 1990 features a 45mm Hardlex-Coated Steel case. It features a Black dial protected by a Sapphire crystal and offers 140m of water resistance. [seikata-wm-5e987e0c31d3]

Also known as: Helmet

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

45mm

Case Thickness

9.9mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

140m

Dial Color

Black

Jewels

28j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1990

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