Named in honor of the brand founder Abraham Louis Breguet in tribute to the Tourbillon invention, which was patented on 7 Messidor year IX (June 26, 1801) according to the French revolutionary calendar. 40mm 18kt rose gold case, 9.65mm thickness, skeleton dial, scratch resistant sapphire crystal, transparent case back, deployant buckle clasp, manual winding movement, brown leather strap, 25 jewels, power reserve 50 h, water resistant to 30m/100ft.