Seiko Cal. 5688 - 531

The Seiko 5688-531 represents an important milestone in Seiko's 1968 lineup. It features a Blue Sunburst dial protected by a Hardlex crystal and offers 30m of water resistance. [seikata-wm-89ae90b2ecd1]

Also known as: Tuna, Pogue

Specifications

Movement

Kinetic

Case Material

Titanium

Case Width

36mm

Case Thickness

13.2mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

30m

Dial Color

Blue Sunburst

Jewels

35j

Frequency

28,800 bph

Power Reserve

72 hours

Year

1968

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