Seiko Cal. 6660 - 981

Seiko 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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