Seiko Cal. 5639 - 397

This Quartz model from 1979 features a 45mm PVD Black case. Powered by the 5639 caliber with 20j jewels beating at 36,000 bph, it delivers a 50 hours power reserve. [seikata-wm-a69ec0afe256]

Also known as: Monster, Baby Tuna

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

45mm

Case Thickness

10.4mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

140m

Dial Color

Silver

Jewels

20j

Frequency

36,000 bph

Power Reserve

50 hours

Year

1979

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