Seiko Cal. 5687 - 690

The Seiko 5687-690 represents an important milestone in Seiko's 1981 lineup. The Fixed bezel and 41mm case give it a distinctive presence on the wrist. [seikata-wm-0c403c16d0d1]

Also known as: Sumo, World Timer

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

41mm

Case Thickness

11.6mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

60m

Dial Color

Cream

Jewels

31j

Frequency

21,600 bph

Power Reserve

55 hours

Year

1981

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