Seiko Cal. 6690 - 761

The Seiko 6690-761 represents an important milestone in Seiko's 1979 lineup. Powered by the 6690 caliber with 21j jewels beating at 28,800 bph, it delivers a 39 hours power reserve. [seikata-wm-ca97354eaca7]

Also known as: Tuna, Flighty

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

37mm

Case Thickness

10.3mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

80m

Dial Color

Navy

Jewels

21j

Frequency

28,800 bph

Power Reserve

39 hours

Year

1979

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