Seiko Cal. 6639 - 655

This Quartz model from 1978 features a 46mm PVD Black case. Powered by the 6639 caliber with 22j jewels beating at 21,600 bph, it delivers a 36 hours power reserve. [seikata-wm-b8c66a4a3d4b]

Also known as: Monster, Navigator

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

46mm

Case Thickness

11.3mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

130m

Dial Color

Green

Jewels

22j

Frequency

21,600 bph

Power Reserve

36 hours

Year

1978

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