Seiko Cal. 6631 - 433

The Seiko 6631-433 represents an important milestone in Seiko's 1981 lineup. The Bidirectional bezel and 44mm case give it a distinctive presence on the wrist. [seikata-wm-1bc8c3590501]

Also known as: Bellmatic

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

44mm

Case Thickness

11.0mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

100m

Dial Color

Black

Jewels

34j

Frequency

36,000 bph

Power Reserve

72 hours

Year

1981

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