Seiko Cal. 6640 - 630

The Seiko 6640-630 represents an important milestone in Seiko's 1980 lineup. Powered by the 6640 caliber with 21j jewels beating at 21,600 bph, it delivers a 68 hours power reserve. [seikata-wm-83c301c7dd3e]

Also known as: Sportsmatic, Flighty

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

36mm

Case Thickness

13.3mm

Lug Width

21mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

90m

Dial Color

White

Jewels

21j

Frequency

21,600 bph

Power Reserve

68 hours

Year

1980

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