Seiko Cal. 5639 - 978

The Seiko 5639-978 represents an important milestone in Seiko's 1973 lineup. Powered by the 5639 caliber with 34j jewels beating at 36,000 bph, it delivers a 38 hours power reserve. [seikata-wm-28df0b51d39f]

Also known as: Bullhead

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

35mm

Case Thickness

14.4mm

Lug Width

22mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

170m

Dial Color

Navy

Jewels

34j

Frequency

36,000 bph

Power Reserve

38 hours

Year

1973

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