Seiko Cal. 6689 - 658

This Spring Drive model from 1965 features a 35mm Titanium case. With its 18mm lug width and 10.9mm profile, it sits comfortably on most wrists. [seikata-wm-d82b9308da74]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

35mm

Case Thickness

10.9mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

200m

Dial Color

Green

Jewels

28j

Frequency

28,800 bph

Power Reserve

51 hours

Year

1965

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