Seiko Cal. 6631 - 443

The Seiko 6631-443 represents an important milestone in Seiko's 1974 lineup. It features a Black dial protected by a Acrylic crystal and offers 90m of water resistance. [seikata-wm-056cc2cbbbd8]

Also known as: Sea Horse

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

34mm

Case Thickness

14.3mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Black

Jewels

36j

Frequency

28,800 bph

Power Reserve

66 hours

Year

1974

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