Seiko Cal. 6639 - 487

This Spring Drive model from 1975 features a 35mm Titanium case. With its 22mm lug width and 15.9mm profile, it sits comfortably on most wrists. [seikata-wm-109c908670d2]

Also known as: Bellmatic

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

35mm

Case Thickness

15.9mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

100m

Dial Color

Navy

Jewels

32j

Frequency

28,800 bph

Power Reserve

60 hours

Year

1975

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