Seiko Cal. 6640 - 639

The 6640-639 is a sought-after Spring Drive piece from Seiko's golden era. With its 19mm lug width and 13.0mm profile, it sits comfortably on most wrists. [seikata-wm-11fcf13bc6ff]

Also known as: Shogun, Golden Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

13.0mm

Lug Width

19mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

120m

Dial Color

White

Jewels

27j

Frequency

36,000 bph

Power Reserve

47 hours

Year

1990

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