Seiko Cal. 6657 - 748

This Solar model from 1972 features a 37mm Two-Tone case. Powered by the 6657 caliber with 27j jewels beating at 21,600 bph, it delivers a 66 hours power reserve. [seikata-wm-c5ba141c94c4]

Also known as: UFO

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

37mm

Case Thickness

11.0mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

80m

Dial Color

Burgundy

Jewels

27j

Frequency

21,600 bph

Power Reserve

66 hours

Year

1972

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