Although time keeping mechanisms have been around for thousands of years, the first mobile clocks did not appear until the 1500s.
In the 1500s, Henry De Vick invented a clock for the royal palace in Paris with a 500-pound.
weight that traveled 32 feet - and it only had an hour hand (as did all clocks in those days).
A hand-held timepiece was a ridiculous thought at that time.
Inventing the portable clock would bring great advances to civilization.
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.
Although the technology was a great leap forward from hanging weights, it was still highly inaccurate because coiled springs don't unwind at a constant speed.
It was needed for the study of astronomy, physics, and for ship captains to calculate location - increasing the likelihood of the safe return of a ship, its cargo, and crew. The first watch-makers were locksmiths and blacksmiths because those guilds worked steel to make tools and implements.
Eventually locksmiths dominated the trade as brass, silver and gold were used to replace steel.