Seiko Cal. 5631 - 549

The Seiko 5631-549 represents an important milestone in Seiko's 1971 lineup. The Bidirectional bezel and 34mm case give it a distinctive presence on the wrist. [seikata-wm-56fc52eced02]

Also known as: Bellmatic

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

34mm

Case Thickness

11.2mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

150m

Dial Color

Black

Jewels

30j

Frequency

36,000 bph

Power Reserve

43 hours

Year

1971

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