Seiko Cal. 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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