Seiko Cal. 6631 - 343

This Spring Drive model from 1986 features a 40mm Stainless Steel case. It features a White dial protected by a Acrylic crystal and offers 130m of water resistance. [seikata-wm-c57d293245cf]

Also known as: Sumo, Silverwave

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

11.5mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

130m

Dial Color

White

Jewels

21j

Frequency

28,800 bph

Power Reserve

57 hours

Year

1986

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