Seiko Cal. 6640 - 673

This Quartz model from 1972 features a 39mm Titanium case. Powered by the 6640 caliber with 20j jewels beating at 21,600 bph, it delivers a 68 hours power reserve. [seikata-wm-4e24d0bdd408]

Also known as: World Timer

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

39mm

Case Thickness

13.6mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

White

Jewels

20j

Frequency

21,600 bph

Power Reserve

68 hours

Year

1972

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