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Crystal / Quartz Watch

A quartz watch is a watch that uses an electronic oscillator that is regulated by a quartz crystal to keep time. This crystal oscillator creates a signal with very precise frequency, so the quartz are more accurate.

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1942 A688 1974 12 Mai Czechoslovakia	789 A254 1977 23 Mai Liberia	215 A21 1979 15 Feb Uganda	444 CD331 1981 22 Jul Fiji
270 CD331 1981 29 Jul Brunei	1762 A763 1992 10 Sep Germany

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Your search for Crystal / Quartz Watch resulted in 6 Stamps