Seiko Cal. 6639 - 897

Seiko 6639-897

The 6639-897 is a sought-after Spring Drive piece from Seiko's golden era. The Inner Rotating bezel and 41mm case give it a distinctive presence on the wrist. [seikata-wm-d561d467918a]

Also known as: Sumo, UFO

Specifications

Movement
Spring Drive
Case Material
Titanium
Case Width
41mm
Case Thickness
13.4mm
Lug Width
19mm
Crystal
Sapphire
Bezel
Inner Rotating
Water Resistance
100m
Dial Color
Silver
Jewels
30j
Frequency
36,000 bph
Power Reserve
53 hours
Year
1984

Related Models

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