Seiko Cal. 5639 - 397

Seiko 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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