Seiko Cal. 5660 - 660

The Seiko 5660-660 represents an important milestone in Seiko's 1979 lineup. Powered by the 5660 caliber with 27j jewels beating at 21,600 bph, it delivers a 63 hours power reserve. [seikata-wm-eb1b8952737a]

Also known as: Sumo

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

46mm

Case Thickness

12.3mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

110m

Dial Color

Black

Jewels

27j

Frequency

21,600 bph

Power Reserve

63 hours

Year

1979

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