Perrelet's new Titanium Collection. Featuring a double rotor seen from front and back.
Back in 1770, the genius watchmaker Abraham-Louis Perrelet invented the "Perpetuelles" automatic winding movement, the original self-winding concept - the pedometer watch, which had an oscillating weight that moved up and down as one walked, supplying energy to the mainspring in the process. And like most geniuses, his invention wasn't appreciated or even appropriate until a mobile wristwatch could be invented - over a hundred years later!
via TimeZone
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