Seiko Cal. 6663 - 151

This Spring Drive model from 1968 features a 37mm Hardlex-Coated Steel case. With its 20mm lug width and 12.4mm profile, it sits comfortably on most wrists. [seikata-wm-70ddcd3e4983]

Also known as: Monster, Sea Horse

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

12.4mm

Lug Width

20mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

60m

Dial Color

Green

Jewels

21j

Frequency

21,600 bph

Power Reserve

61 hours

Year

1968

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