Seiko Cal. 6639 - 780

The 6639-780 is a sought-after Quartz piece from Seiko's golden era. Powered by the 6639 caliber with 26j jewels beating at 28,800 bph, it delivers a 44 hours power reserve. [seikata-wm-de5fde9138ea]

Also known as: World Timer

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

35mm

Case Thickness

10.1mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

120m

Dial Color

Champagne

Jewels

26j

Frequency

28,800 bph

Power Reserve

44 hours

Year

1975

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