Seiko Cal. 6640 - 890

The Seiko 6640-890 represents an important milestone in Seiko's 1971 lineup. Powered by the 6640 caliber with 32j jewels beating at 21,600 bph, it delivers a 65 hours power reserve. [seikata-wm-4f6b9874133f]

Also known as: Arnie, Flighty

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

41mm

Case Thickness

11.5mm

Lug Width

22mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

90m

Dial Color

Champagne

Jewels

32j

Frequency

21,600 bph

Power Reserve

65 hours

Year

1971

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