Seiko Cal. 6640 - 366

The Seiko 6640-366 represents an important milestone in Seiko's 1987 lineup. With its 18mm lug width and 9.7mm profile, it sits comfortably on most wrists. [seikata-wm-cb4bb548bd9e]

Also known as: Silverwave

Specifications

Movement

Kinetic

Case Material

Stainless Steel

Case Width

41mm

Case Thickness

9.7mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

180m

Dial Color

Champagne

Jewels

30j

Frequency

36,000 bph

Power Reserve

71 hours

Year

1987

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