Seiko Cal. 6691 - 660

The Seiko 6691-660 represents an important milestone in Seiko's 1968 lineup. Powered by the 6691 caliber with 18j jewels beating at 28,800 bph, it delivers a 42 hours power reserve. [seikata-wm-35e5488b930a]

Also known as: Sportsmatic, Flighty

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

37mm

Case Thickness

11.3mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

50m

Dial Color

Cream

Jewels

18j

Frequency

28,800 bph

Power Reserve

42 hours

Year

1968

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