Seiko Cal. 6643 - 587

The Seiko 6643-587 represents an important milestone in Seiko's 1966 lineup. With its 18mm lug width and 15.7mm profile, it sits comfortably on most wrists. [seikata-wm-47d0d5398c03]

Also known as: Tuna, World Timer

Specifications

Movement

Kinetic

Case Material

PVD Black

Case Width

38mm

Case Thickness

15.7mm

Lug Width

18mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

110m

Dial Color

Cream

Jewels

25j

Frequency

36,000 bph

Power Reserve

36 hours

Year

1966

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