Seiko Cal. 6640 - 468

The Seiko 6640-468 represents an important milestone in Seiko's 1977 lineup. Powered by the 6640 caliber with 27j jewels beating at 21,600 bph, it delivers a 36 hours power reserve. [seikata-wm-96185a76aeec]

Also known as: Turtle, Arnie

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

35mm

Case Thickness

9.0mm

Lug Width

21mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

50m

Dial Color

White

Jewels

27j

Frequency

21,600 bph

Power Reserve

36 hours

Year

1977

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