Seiko Cal. 6631 - 783

Seiko 6631-783

The 6631-783 is a sought-after Kinetic piece from Seiko's golden era. The Fixed bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-e4f9f81ccce6]

Also known as: Bullhead, Golden Tuna

Specifications

Movement
Kinetic
Case Material
Two-Tone
Case Width
37mm
Case Thickness
13.7mm
Lug Width
18mm
Crystal
Acrylic
Bezel
Fixed
Water Resistance
200m
Dial Color
Champagne
Jewels
33j
Frequency
21,600 bph
Power Reserve
69 hours
Year
1970

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