Seiko Cal. 6640 - 848

The Seiko 6640-848 represents an important milestone in Seiko's 1966 lineup. The Inner Rotating bezel and 42mm case give it a distinctive presence on the wrist. [seikata-wm-f41dd585aea7]

Also known as: Turtle, Sea Horse

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

42mm

Case Thickness

11.1mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

100m

Dial Color

Blue Sunburst

Jewels

20j

Frequency

21,600 bph

Power Reserve

50 hours

Year

1966

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