Seiko Cal. 5691 - 766

This Spring Drive model from 1977 features a 37mm PVD Black case. With its 21mm lug width and 9.1mm profile, it sits comfortably on most wrists. [seikata-wm-12b5f6f4fbed]

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

37mm

Case Thickness

9.1mm

Lug Width

21mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

110m

Dial Color

Green

Jewels

30j

Frequency

21,600 bph

Power Reserve

69 hours

Year

1977

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