Seiko Cal. 6690 - 135

The Seiko 6690-135 represents an important milestone in Seiko's 1971 lineup. The Bidirectional bezel and 42mm case give it a distinctive presence on the wrist. [seikata-wm-a546e58f4ee3]

Also known as: Bullhead

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

8.7mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

50m

Dial Color

Green

Jewels

34j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1971

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