Seiko Cal. 5631 - 130

The Seiko 5631-130 represents an important milestone in Seiko's 1978 lineup. With its 21mm lug width and 9.8mm profile, it sits comfortably on most wrists. [seikata-wm-07005ceb173c]

Also known as: Tuna

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

34mm

Case Thickness

9.8mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

190m

Dial Color

Cream

Jewels

33j

Frequency

28,800 bph

Power Reserve

60 hours

Year

1978

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