Seiko Cal. 6639 - 726

The Seiko 6639-726 represents an important milestone in Seiko's 1976 lineup. Powered by the 6639 caliber with 18j jewels beating at 36,000 bph, it delivers a 60 hours power reserve. [seikata-wm-5438ddc16e6a]

Also known as: Rally, Goldfeather

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

40mm

Case Thickness

11.5mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

60m

Dial Color

Black

Jewels

18j

Frequency

36,000 bph

Power Reserve

60 hours

Year

1976

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