Seiko Cal. 6631 - 428

This Automatic model from 1980 features a 44mm Stainless Steel case. It features a Silver dial protected by a Hardlex crystal and offers 100m of water resistance. [seikata-wm-af83680c9716]

Also known as: Tuna, Navigator

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

44mm

Case Thickness

10.1mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

100m

Dial Color

Silver

Jewels

25j

Frequency

28,800 bph

Power Reserve

44 hours

Year

1980

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