Seiko Cal. 6639 - 717

Seiko 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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