Seiko Cal. 6691 - 978

This Spring Drive model from 1967 features a 36mm Titanium case. With its 18mm lug width and 13.5mm profile, it sits comfortably on most wrists. [seikata-wm-2ce6af080805]

Also known as: Turtle

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

36mm

Case Thickness

13.5mm

Lug Width

18mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

140m

Dial Color

Burgundy

Jewels

33j

Frequency

21,600 bph

Power Reserve

40 hours

Year

1967

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