Seiko Cal. 6657 - 576

The Seiko 6657-576 represents an important milestone in Seiko's 1977 lineup. Powered by the 6657 caliber with 35j jewels beating at 36,000 bph, it delivers a 62 hours power reserve. [seikata-wm-aaad82bcc9a5]

Also known as: Sumo, Navigator

Specifications

Movement

Kinetic

Case Material

Stainless Steel

Case Width

43mm

Case Thickness

15.5mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

100m

Dial Color

Green

Jewels

35j

Frequency

36,000 bph

Power Reserve

62 hours

Year

1977

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