Seiko Cal. 5631 - 707

The Seiko 5631-707 represents an important milestone in Seiko's 1966 lineup. Powered by the 5631 caliber with 25j jewels beating at 36,000 bph, it delivers a 44 hours power reserve. [seikata-wm-0c5a8e41c2df]

Also known as: Golden Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

14.5mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

170m

Dial Color

Burgundy

Jewels

25j

Frequency

36,000 bph

Power Reserve

44 hours

Year

1966

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