Seiko Cal. 6691 - 138

The Seiko 6691-138 represents an important milestone in Seiko's 1971 lineup. Powered by the 6691 caliber with 20j jewels beating at 21,600 bph, it delivers a 56 hours power reserve. [seikata-wm-6ae97ac9537c]

Also known as: Crown

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

42mm

Case Thickness

11.1mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Silver

Jewels

20j

Frequency

21,600 bph

Power Reserve

56 hours

Year

1971

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