Seiko Cal. 6687 - 397

This Spring Drive model from 1981 features a 42mm Stainless Steel case. With its 18mm lug width and 11.8mm profile, it sits comfortably on most wrists. [seikata-wm-b8b0b0643223]

Also known as: Monster, World Timer

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

42mm

Case Thickness

11.8mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

170m

Dial Color

Black

Jewels

25j

Frequency

21,600 bph

Power Reserve

48 hours

Year

1981

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