Seiko Cal. 6639 - 478

The Seiko 6639-478 represents an important milestone in Seiko's 1987 lineup. With its 20mm lug width and 11.5mm profile, it sits comfortably on most wrists. [seikata-wm-9756be532bcc]

Also known as: Turtle

Specifications

Movement

Solar

Case Material

Titanium

Case Width

39mm

Case Thickness

11.5mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

80m

Dial Color

Black

Jewels

27j

Frequency

36,000 bph

Power Reserve

52 hours

Year

1987

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