Seiko Cal. 6691 - 931

This Automatic model from 1966 features a 42mm Gold-Plated case. Powered by the 6691 caliber with 29j jewels beating at 36,000 bph, it delivers a 72 hours power reserve. [seikata-wm-305a25605d2c]

Also known as: Tuna, Crown

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

42mm

Case Thickness

11.1mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

180m

Dial Color

Burgundy

Jewels

29j

Frequency

36,000 bph

Power Reserve

72 hours

Year

1966

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