Seiko Cal. 6631 - 726

The 6631-726 is a sought-after Automatic piece from Seiko's golden era. Powered by the 6631 caliber with 31j jewels beating at 28,800 bph, it delivers a 56 hours power reserve. [seikata-wm-85187491dff4]

Also known as: Rally

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

43mm

Case Thickness

9.0mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

70m

Dial Color

Green

Jewels

31j

Frequency

28,800 bph

Power Reserve

56 hours

Year

1972

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