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A hand-held timepiece was a ridiculous thought at that time.
Until that time, a clock's mechanism was so large, heavy and ponderous, few people considered the possibility of a portable clock.
It was the discovery of spring technology by Peter Henlein and others that made the personal timepiece possible.
Spiral springs could be wound and uncoiled to move the hour hand of the clock.
Today, the number of jewels a watch has is a sign of its quality and durability.
Finding a pocket watch made prior to 1700 is rare these days. Antique watches crafted before 1865 are very popular.
They are sought by collectors and Civil War buffs and re-enactors, says Eric Engh, co-owner of the website the world's largest seller of pocket watches on the internet."Walthams, in particular, are very collectible," he said.