Seiko Cal. 6657 - 662

The Seiko 6657-662 represents an important milestone in Seiko's 1980 lineup. Powered by the 6657 caliber with 36j jewels beating at 28,800 bph, it delivers a 63 hours power reserve. [seikata-wm-90f2dc791847]

Also known as: Sumo

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

37mm

Case Thickness

12.0mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

40m

Dial Color

Green

Jewels

36j

Frequency

28,800 bph

Power Reserve

63 hours

Year

1980

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