Seiko Cal. 6636 - 647

Seiko 6636-647

The 6636-647 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-01f9719fd5d0]

Also known as: Monster, World Timer

Specifications

Movement
Automatic
Case Material
Hardlex-Coated Steel
Case Width
35mm
Case Thickness
9.6mm
Lug Width
22mm
Crystal
Acrylic
Bezel
Inner Rotating
Water Resistance
200m
Dial Color
Blue Sunburst
Jewels
35j
Frequency
28,800 bph
Power Reserve
39 hours
Year
1975

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