Seiko Cal. 5631 - 279

The Seiko 5631-279 represents an important milestone in Seiko's 1975 lineup. It features a Silver dial protected by a Hardlex crystal and offers 80m of water resistance. [seikata-wm-50e6b8da9a4d]

Also known as: Sumo, Bellmatic

Specifications

Movement

Kinetic

Case Material

PVD Black

Case Width

38mm

Case Thickness

8.2mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

80m

Dial Color

Silver

Jewels

23j

Frequency

28,800 bph

Power Reserve

55 hours

Year

1975

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