Seiko Cal. 6690 - 104

The Seiko 6690-104 represents an important milestone in Seiko's 1971 lineup. Powered by the 6690 caliber with 30j jewels beating at 28,800 bph, it delivers a 69 hours power reserve. [seikata-wm-ac86c2aed662]

Also known as: Bullhead

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

37mm

Case Thickness

12.8mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

90m

Dial Color

Green

Jewels

30j

Frequency

28,800 bph

Power Reserve

69 hours

Year

1971

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