Seiko Cal. 6640 - 997

Seiko 6640-997

The 6640-997 is a sought-after Quartz piece from Seiko's golden era. The Fixed bezel and 34mm case give it a distinctive presence on the wrist. [seikata-wm-c297b64a87e7]

Also known as: Monster, Bullhead

Specifications

Movement
Quartz
Case Material
Hardlex-Coated Steel
Case Width
34mm
Case Thickness
8.1mm
Lug Width
22mm
Crystal
Acrylic
Bezel
Fixed
Water Resistance
130m
Dial Color
Black
Jewels
25j
Frequency
36,000 bph
Power Reserve
61 hours
Year
1971

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