Seiko Cal. 5647 - 731

The Seiko 5647-731 represents an important milestone in Seiko's 1988 lineup. With its 18mm lug width and 14.6mm profile, it sits comfortably on most wrists. [seikata-wm-04741e4ffdff]

Also known as: Baby Tuna

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

35mm

Case Thickness

14.6mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

30m

Dial Color

Black

Jewels

33j

Frequency

36,000 bph

Power Reserve

70 hours

Year

1988

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