Seiko Cal. 5639 - 998

Seiko 5639-998

The 5639-998 is a sought-after Quartz piece from Seiko's golden era. Powered by the 5639 caliber with 25j jewels beating at 21,600 bph, it delivers a 69 hours power reserve. [seikata-wm-47e54d48f2e8]

Also known as: Bullhead, Bellmatic

Specifications

Movement
Quartz
Case Material
Titanium
Case Width
36mm
Case Thickness
10.5mm
Lug Width
18mm
Crystal
Hardlex
Bezel
Inner Rotating
Water Resistance
50m
Dial Color
White
Jewels
25j
Frequency
21,600 bph
Power Reserve
69 hours
Year
1979

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