Seiko Cal. 6643 - 655

This Spring Drive model from 1978 features a 37mm Titanium case. With its 21mm lug width and 14.9mm profile, it sits comfortably on most wrists. [seikata-wm-dc185fd8df0e]

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

37mm

Case Thickness

14.9mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

170m

Dial Color

Black

Jewels

33j

Frequency

21,600 bph

Power Reserve

70 hours

Year

1978

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