Seiko Cal. 6690 - 971

The Seiko 6690-971 represents an important milestone in Seiko's 1981 lineup. Powered by the 6690 caliber with 26j jewels beating at 28,800 bph, it delivers a 37 hours power reserve. [seikata-wm-cf8e6cc0de3a]

Also known as: Bullhead

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

43mm

Case Thickness

13.1mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

190m

Dial Color

White

Jewels

26j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1981

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