On 26 June 1801 (7 Messidor, Year 9), Abraham-Louis Breguet registered his patent for the tourbillon regulator. Although he was a prolific inventor, A-L Breguet only ever registered two patents. He registered his first patent for the constant force escapement only a few years earlier on 9 March 1798. Both original patents are preserved at the Institut National de la Propriété Industrielle in Paris. This is the water-colour illustration for the tourbillon patent:

Breguet tourbillon patent, tourbillon patent 1801
Water-colour illustration for the tourbillon patent filed on 26 June 1801
Institut National de la Propriété Industrielle, Paris

During his lifetime, A-L Breguet made only 35 examples of the Tourbillon between 1805 and 1823. This simple tourbillon chronometer (garde-temps) with engine-turned hunter case was sold on 21 March 1812 for 1,800 francs:

tourbillon regulator, Breguet Tourbillon, Breguet Regulateur A Tourbillon, Breguet 2567, Tourbillon 2567, Collection Montres Breguet
Regulateur A Tourbillon, No. 2567 (1812)
Collection Montres Breguet S.A.

For related, see also:
At the Breguet Tourbillon Exhibition Launch in Beverly Hills
The Royal Collection: A.-L. Breguet Clocks and Watches

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