Seiko Cal. 0731 - 187

The Seiko 0731-187 represents an important milestone in Seiko's 1980 lineup. It features a Black dial protected by a Mineral crystal and offers 80m of water resistance. [seikata-wm-75b1056a7ff7]

Also known as: Monster, Sumo

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

43mm

Case Thickness

9.2mm

Lug Width

19mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

80m

Dial Color

Black

Jewels

18j

Frequency

21,600 bph

Power Reserve

53 hours

Year

1980

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