Seiko Cal. 6691 - 431

The Seiko 6691-431 represents an important milestone in Seiko's 1973 lineup. Powered by the 6691 caliber with 25j jewels beating at 36,000 bph, it delivers a 42 hours power reserve. [seikata-wm-6077c38b40fb]

Also known as: Baby Tuna

Specifications

Movement

Kinetic

Case Material

Titanium

Case Width

45mm

Case Thickness

10.6mm

Lug Width

18mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

180m

Dial Color

Cream

Jewels

25j

Frequency

36,000 bph

Power Reserve

42 hours

Year

1973

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