Seiko Cal. 6390 - 640

The 6390-640 is a sought-after Quartz piece from Seiko's golden era. Powered by the 6390 caliber with 22j jewels beating at 36,000 bph, it delivers a 47 hours power reserve. [seikata-wm-4ef82ba087c5]

Also known as: Goldfeather

Specifications

Movement

Quartz

Case Material

Stainless Steel

Case Width

42mm

Case Thickness

14.2mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

90m

Dial Color

Champagne

Jewels

22j

Frequency

36,000 bph

Power Reserve

47 hours

Year

1977

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