Approx. Ø57mm, ca. 223g, 18K gold, Savonnette à-goutte, signed, housing and work number equal to 189120, factory glazing, legendary Girard Perregaux Tourbillon with 3 gold bridges, golden gait wheel and chronometer inhibition, signed enamel dial (fine hair cracked, small restoration), Breguet steel hand, original box, functional, sensational quality. The watch is not only one of the legendary Girard Perregaux 3-bridge tourbillons, but also a 2-fold tested observatory chronometer, tested in 1892 and 1900 at the Neuchâtel Observatory. The sister watch 189119 was auctioned in New York in 2016 and scored approximately 100,000US$ (https://www.cortrie.de/go/j1L).