Seiko Cal. 6638 - 340

Seiko 6638-340

This Spring Drive model from 1971 features a 44mm Stainless Steel case. With its 19mm lug width and 8.6mm profile, it sits comfortably on most wrists. [seikata-wm-bbcc79ff2a9f]

Also known as: Helmet, UFO

Specifications

Movement
Spring Drive
Case Material
Stainless Steel
Case Width
44mm
Case Thickness
8.6mm
Lug Width
19mm
Crystal
Acrylic
Bezel
Inner Rotating
Water Resistance
30m
Dial Color
Green
Jewels
35j
Frequency
21,600 bph
Power Reserve
66 hours
Year
1971

Related Models

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