Seiko Cal. 6643 - 140

This Quartz model from 1975 features a 46mm Hardlex-Coated Steel case. The Inner Rotating bezel and 46mm case give it a distinctive presence on the wrist. [seikata-wm-e89546c6da30]

Also known as: UFO, Baby Tuna

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

46mm

Case Thickness

10.6mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Black

Jewels

24j

Frequency

21,600 bph

Power Reserve

63 hours

Year

1975

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