Seiko Cal. 6640 - 528

The 6640-528 is a sought-after Quartz piece from Seiko's golden era. With its 18mm lug width and 8.2mm profile, it sits comfortably on most wrists. [seikata-wm-82c02c9e4303]

Also known as: Silverwave

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

34mm

Case Thickness

8.2mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

130m

Dial Color

Burgundy

Jewels

19j

Frequency

21,600 bph

Power Reserve

70 hours

Year

1994

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