Seiko Cal. 6663 - 635

This Spring Drive model from 1977 features a 39mm Gold-Plated case. Powered by the 6663 caliber with 34j jewels beating at 21,600 bph, it delivers a 37 hours power reserve. [seikata-wm-0d6dd20acbd3]

Also known as: UFO

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

39mm

Case Thickness

14.4mm

Lug Width

19mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

130m

Dial Color

Silver

Jewels

34j

Frequency

21,600 bph

Power Reserve

37 hours

Year

1977

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