Seiko Cal. 6691 - 660

The Seiko 6691-660 represents an important milestone in Seiko's 1967 lineup. The Fixed bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-d70e3ceb3802]

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

40mm

Case Thickness

15.9mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

60m

Dial Color

Black

Jewels

33j

Frequency

28,800 bph

Power Reserve

57 hours

Year

1967

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