Seiko Cal. 6635 - 878

The 6635-878 is a sought-after Spring Drive piece from Seiko's golden era. With its 18mm lug width and 12.9mm profile, it sits comfortably on most wrists. [seikata-wm-ef8abf799804]

Also known as: UFO, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

12.9mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

170m

Dial Color

Silver

Jewels

30j

Frequency

28,800 bph

Power Reserve

63 hours

Year

1984

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