Seiko Cal. 5631 - 691

The 5631-691 is a sought-after Automatic piece from Seiko's golden era. Powered by the 5631 caliber with 17j jewels beating at 21,600 bph, it delivers a 62 hours power reserve. [seikata-wm-9a312d00f281]

Also known as: Goldfeather, World Timer

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

35mm

Case Thickness

9.7mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

180m

Dial Color

Blue Sunburst

Jewels

17j

Frequency

21,600 bph

Power Reserve

62 hours

Year

1991

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