Seiko Cal. 6640 - 633

The Seiko 6640-633 represents an important milestone in Seiko's 1975 lineup. The Inner Rotating bezel and 42mm case give it a distinctive presence on the wrist. [seikata-wm-6b920f9a3414]

Also known as: Shogun

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

42mm

Case Thickness

15.0mm

Lug Width

19mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

130m

Dial Color

Cream

Jewels

27j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1975

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