Seiko Cal. 6640 - 477

The Seiko 6640-477 represents an important milestone in Seiko's 1999 lineup. The Inner Rotating bezel and 42mm case give it a distinctive presence on the wrist. [seikata-wm-318df2255db5]

Also known as: Turtle, UFO

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

42mm

Case Thickness

15.9mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

White

Jewels

28j

Frequency

28,800 bph

Power Reserve

71 hours

Year

1999

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