Seiko Cal. 5660 - 231

The Seiko 5660-231 represents an important milestone in Seiko's 1980 lineup. It features a Blue Sunburst dial protected by a Acrylic crystal and offers 50m of water resistance. [seikata-wm-678b8032eb12]

Also known as: Silverwave, Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

15.4mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

50m

Dial Color

Blue Sunburst

Jewels

34j

Frequency

36,000 bph

Power Reserve

67 hours

Year

1980

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