Seiko Cal. 6639 - 717

The 6639-717 is a sought-after Quartz piece from Seiko's golden era. Powered by the 6639 caliber with 19j jewels beating at 28,800 bph, it delivers a 41 hours power reserve. [seikata-wm-defdfaea4f4e]

Also known as: Monster, Helmet

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

44mm

Case Thickness

15.2mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

190m

Dial Color

Navy

Jewels

19j

Frequency

28,800 bph

Power Reserve

41 hours

Year

1972

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