Seiko Cal. 6631 - 729

Seiko 6631-729

The 6631-729 is a sought-after Kinetic piece from Seiko's golden era. Powered by the 6631 caliber with 29j jewels beating at 21,600 bph, it delivers a 69 hours power reserve. [seikata-wm-42acedf07c65]

Also known as: Sumo

Specifications

Movement
Kinetic
Case Material
Hardlex-Coated Steel
Case Width
35mm
Case Thickness
10.8mm
Lug Width
18mm
Crystal
Sapphire
Bezel
Inner Rotating
Water Resistance
160m
Dial Color
White
Jewels
29j
Frequency
21,600 bph
Power Reserve
69 hours
Year
1974

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seikata-wm-42acedf07c65