Seiko Cal. 6638 - 766

Seiko 6638-766

The Seiko 6638-766 represents an important milestone in Seiko's 1985 lineup. Powered by the 6638 caliber with 25j jewels beating at 28,800 bph, it delivers a 52 hours power reserve. [seikata-wm-66b43dc7513f]

Also known as: Helmet

Specifications

Movement
Quartz
Case Material
PVD Black
Case Width
38mm
Case Thickness
9.9mm
Lug Width
22mm
Crystal
Sapphire
Bezel
Fixed
Water Resistance
90m
Dial Color
Burgundy
Jewels
25j
Frequency
28,800 bph
Power Reserve
52 hours
Year
1985

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