Seiko Cal. 6639 - 722

Seiko 6639-722

The Seiko 6639-722 represents an important milestone in Seiko's 1978 lineup. The Rotating bezel and 44mm case give it a distinctive presence on the wrist. [seikata-wm-b30a9b24946e]

Also known as: Helmet, Sportsmatic

Specifications

Movement
Quartz
Case Material
Gold-Plated
Case Width
44mm
Case Thickness
14.9mm
Lug Width
18mm
Crystal
Hardlex
Bezel
Rotating
Water Resistance
200m
Dial Color
Burgundy
Jewels
18j
Frequency
21,600 bph
Power Reserve
63 hours
Year
1978

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