Seiko Cal. 6657 - 618

The Seiko 6657-618 represents an important milestone in Seiko's 1976 lineup. The Coin-Edge bezel and 39mm case give it a distinctive presence on the wrist. [seikata-wm-f8cb4c1b5062]

Also known as: Sumo, Rally

Specifications

Movement

Solar

Case Material

Gold-Plated

Case Width

39mm

Case Thickness

10.4mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

80m

Dial Color

White

Jewels

30j

Frequency

21,600 bph

Power Reserve

37 hours

Year

1976

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