Seiko Cal. 6631 - 478

The Seiko 6631-478 represents an important milestone in Seiko's 1986 lineup. It features a Black dial protected by a Mineral crystal and offers 140m of water resistance. [seikata-wm-039102641d26]

Also known as: Navigator

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

37mm

Case Thickness

14.3mm

Lug Width

21mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

140m

Dial Color

Black

Jewels

23j

Frequency

28,800 bph

Power Reserve

56 hours

Year

1986

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