Seiko Cal. 5660 - 231

This Spring Drive model from 1981 features a 39mm Stainless Steel case. With its 20mm lug width and 11.6mm profile, it sits comfortably on most wrists. [seikata-wm-1df0f260bed9]

Also known as: Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

39mm

Case Thickness

11.6mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

110m

Dial Color

Burgundy

Jewels

30j

Frequency

36,000 bph

Power Reserve

50 hours

Year

1981

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