Seiko Cal. 6640 - 682

The Seiko 6640-682 represents an important milestone in Seiko's 1982 lineup. Powered by the 6640 caliber with 31j jewels beating at 36,000 bph, it delivers a 39 hours power reserve. [seikata-wm-51c6da28302c]

Also known as: Crown

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

42mm

Case Thickness

10.9mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Navy

Jewels

31j

Frequency

36,000 bph

Power Reserve

39 hours

Year

1982

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