Seiko Cal. 5688 - 645

The Seiko 5688-645 represents an important milestone in Seiko's 1987 lineup. It features a Black dial protected by a Acrylic crystal and offers 30m of water resistance. [seikata-wm-2cc950bec6a5]

Also known as: Tuna

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

11.9mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

30m

Dial Color

Black

Jewels

24j

Frequency

21,600 bph

Power Reserve

69 hours

Year

1987

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