Seiko Cal. 6690 - 306

The Seiko 6690-306 represents an important milestone in Seiko's 1997 lineup. Powered by the 6690 caliber with 21j jewels beating at 21,600 bph, it delivers a 55 hours power reserve. [seikata-wm-f5aef8e93b3c]

Also known as: Bullhead, Rally

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

44mm

Case Thickness

9.2mm

Lug Width

19mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Navy

Jewels

21j

Frequency

21,600 bph

Power Reserve

55 hours

Year

1997

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