Seiko Cal. 6131 - 997

The Seiko 6131-997 represents an important milestone in Seiko's 1966 lineup. Powered by the 6131 caliber with 18j jewels beating at 21,600 bph, it delivers a 66 hours power reserve. [seikata-wm-4aae1b96b30a]

Also known as: Crown

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

38mm

Case Thickness

11.2mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

80m

Dial Color

Navy

Jewels

18j

Frequency

21,600 bph

Power Reserve

66 hours

Year

1966

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