Seiko Cal. 5660 - 931

The Seiko 5660-931 represents an important milestone in Seiko's 1986 lineup. Powered by the 5660 caliber with 31j jewels beating at 36,000 bph, it delivers a 60 hours power reserve. [seikata-wm-5075a797a5e8]

Also known as: Pogue, Bullhead

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

37mm

Case Thickness

11.0mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

100m

Dial Color

Blue Sunburst

Jewels

31j

Frequency

36,000 bph

Power Reserve

60 hours

Year

1986

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