Seiko Cal. 6640 - 974

The Seiko 6640-974 represents an important milestone in Seiko's 1980 lineup. The Inner Rotating bezel and 35mm case give it a distinctive presence on the wrist. [seikata-wm-0f46f9847664]

Also known as: Panda, Navigator

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

35mm

Case Thickness

12.1mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Burgundy

Jewels

26j

Frequency

36,000 bph

Power Reserve

56 hours

Year

1980

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