Watch

Creation of the Watch

Oct 9, 1770

This is when the Watch was first invented by Abraham-Louis Perrelet (self-winding mechanism). https://en.wikipedia.org/wiki/Watch

Revision: Watch Podometer

Oct 9, 1780

Abraham Develops the 1st podometer, and creates the 1st Cylinder Watch.
https://www.perrelet.com/en/brand/history

Re-invention: Chronograph Counter (Watch)

Oct 9, 1827

Abraham's Grandson presents a chronograph counter for physics and astronomy with flyback hand.

Develop: Double Rotor (Watch)

Oct 9, 1995

The Perrelet House develops the first "Double Rotor" caliber: a system unique in it's kind, which connects the winding weight of the automatic system to a rotor on the dial side.
https://www.perrelet.com/en/brand/history

Revision: Turbine Model, & Anniversary of the Double Rotor

Period: Oct 9, 2009 to Oct 9, 2015

Perrelet finally creates a design that is superb and overall better than any other template the Perrelet house has ever used; Caliber P-481
https://www.perrelet.com/en/brand/history