Seiko Cal. 6660 - 981

The Seiko 6660-981 represents an important milestone in Seiko's 1987 lineup. Powered by the 6660 caliber with 18j jewels beating at 36,000 bph, it delivers a 41 hours power reserve. [seikata-wm-b9bb8df661ec]

Also known as: Sumo, Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

38mm

Case Thickness

12.5mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

100m

Dial Color

Burgundy

Jewels

18j

Frequency

36,000 bph

Power Reserve

41 hours

Year

1987

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