Seiko Cal. 6660 - 687

The Seiko 6660-687 represents an important milestone in Seiko's 1977 lineup. Powered by the 6660 caliber with 25j jewels beating at 28,800 bph, it delivers a 64 hours power reserve. [seikata-wm-00429909c349]

Also known as: Sumo, Arnie

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

36mm

Case Thickness

10.6mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

170m

Dial Color

Cream

Jewels

25j

Frequency

28,800 bph

Power Reserve

64 hours

Year

1977

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