Seiko Cal. 6638 - 990

Seiko 6638-990

The Seiko 6638-990 represents an important milestone in Seiko's 1973 lineup. The Fixed bezel and 36mm case give it a distinctive presence on the wrist. [seikata-wm-9ac68f9f8319]

Also known as: UFO

Specifications

Movement
Spring Drive
Case Material
Titanium
Case Width
36mm
Case Thickness
12.9mm
Lug Width
21mm
Crystal
Sapphire
Bezel
Fixed
Water Resistance
60m
Dial Color
White
Jewels
35j
Frequency
21,600 bph
Power Reserve
36 hours
Year
1973

Related Models

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