Seiko Cal. 6691 - 540

This Automatic model from 1970 features a 38mm Hardlex-Coated Steel case. Powered by the 6691 caliber with 30j jewels beating at 21,600 bph, it delivers a 68 hours power reserve. [seikata-wm-443a8d1734eb]

Also known as: Golden Tuna, Flighty

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

8.0mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

150m

Dial Color

Black

Jewels

30j

Frequency

21,600 bph

Power Reserve

68 hours

Year

1970

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