Seiko Cal. 6639 - 557

The 6639-557 is a sought-after Solar piece from Seiko's golden era. Powered by the 6639 caliber with 17j jewels beating at 28,800 bph, it delivers a 53 hours power reserve. [seikata-wm-6fec81ab312d]

Also known as: Helmet, Flighty

Specifications

Movement

Solar

Case Material

Stainless Steel

Case Width

41mm

Case Thickness

12.7mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

100m

Dial Color

Cream

Jewels

17j

Frequency

28,800 bph

Power Reserve

53 hours

Year

1994

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