Seiko Cal. 6643 - 278

This Spring Drive model from 1967 features a 37mm Titanium case. The Fixed bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-3382695be2cb]

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

37mm

Case Thickness

13.1mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

150m

Dial Color

Black

Jewels

26j

Frequency

21,600 bph

Power Reserve

68 hours

Year

1967

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