Seiko Cal. 3870 - 731

This Spring Drive model from 1987 features a 34mm Gold-Plated case. With its 18mm lug width and 11.1mm profile, it sits comfortably on most wrists. [seikata-wm-eb7466aa0b04]

Also known as: Monster, Rally

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

34mm

Case Thickness

11.1mm

Lug Width

18mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

90m

Dial Color

Champagne

Jewels

36j

Frequency

36,000 bph

Power Reserve

61 hours

Year

1987

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