Seiko Cal. 6688 - 404

This Spring Drive model from 1978 features a 37mm PVD Black case. The Bidirectional bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-143fb87e126a]

Also known as: Silverwave, Golden Tuna

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

37mm

Case Thickness

12.6mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

120m

Dial Color

Blue Sunburst

Jewels

33j

Frequency

28,800 bph

Power Reserve

63 hours

Year

1978

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