Seiko Cal. 6664 - 633

This Automatic model from 1977 features a 39mm PVD Black case. Powered by the 6664 caliber with 21j jewels beating at 28,800 bph, it delivers a 64 hours power reserve. [seikata-wm-085f185fb7c4]

Also known as: UFO, Sportsmatic

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

39mm

Case Thickness

9.8mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Black

Jewels

21j

Frequency

28,800 bph

Power Reserve

64 hours

Year

1977

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