Seiko Cal. 5640 - 198

This Spring Drive model from 1976 features a 43mm PVD Black case. The Inner Rotating bezel and 43mm case give it a distinctive presence on the wrist. [seikata-wm-fd80125dd9c9]

Also known as: Monster, Tuna

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

43mm

Case Thickness

10.0mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Cream

Jewels

30j

Frequency

28,800 bph

Power Reserve

49 hours

Year

1976

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