Seiko Cal. 6638 - 397

Seiko 6638-397

The 6638-397 is a sought-after Automatic piece from Seiko's golden era. The Inner Rotating bezel and 35mm case give it a distinctive presence on the wrist. [seikata-wm-fed53cee9f0a]

Also known as: Helmet, UFO

Specifications

Movement
Automatic
Case Material
PVD Black
Case Width
35mm
Case Thickness
11.8mm
Lug Width
19mm
Crystal
Mineral
Bezel
Inner Rotating
Water Resistance
200m
Dial Color
Navy
Jewels
23j
Frequency
36,000 bph
Power Reserve
39 hours
Year
1970

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