Seiko Cal. 6643 - 818

The Seiko 6643-818 represents an important milestone in Seiko's 1987 lineup. With its 21mm lug width and 8.8mm profile, it sits comfortably on most wrists. [seikata-wm-fbd328abd2ca]

Also known as: Sea Horse

Specifications

Movement

Solar

Case Material

Stainless Steel

Case Width

43mm

Case Thickness

8.8mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Champagne

Jewels

22j

Frequency

21,600 bph

Power Reserve

60 hours

Year

1987

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