Seiko Cal. 6640 - 730

The Seiko 6640-730 represents an important milestone in Seiko's 1975 lineup. The Fixed bezel and 35mm case give it a distinctive presence on the wrist. [seikata-wm-b9708c96e2a4]

Also known as: Emperor

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

35mm

Case Thickness

10.5mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

140m

Dial Color

Burgundy

Jewels

23j

Frequency

21,600 bph

Power Reserve

65 hours

Year

1975

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