Seiko Cal. 5639 - 654

The Seiko 5639-654 represents an important milestone in Seiko's 1978 lineup. With its 21mm lug width and 11.8mm profile, it sits comfortably on most wrists. [seikata-wm-6b7fea8dfcbd]

Also known as: UFO, Baby Tuna

Specifications

Movement

Kinetic

Case Material

Gold-Plated

Case Width

40mm

Case Thickness

11.8mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

120m

Dial Color

Green

Jewels

19j

Frequency

21,600 bph

Power Reserve

52 hours

Year

1978

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