Seiko Cal. 6691 - 366

This Spring Drive model from 1971 features a 40mm Titanium case. The Rotating bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-ac647ea0de43]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

40mm

Case Thickness

9.7mm

Lug Width

19mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

150m

Dial Color

Burgundy

Jewels

17j

Frequency

28,800 bph

Power Reserve

69 hours

Year

1971

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