Fine and rare Swiss gold lever watch with power reserve Circa 1910

Gold open faced lever watch by Patek Philippe
–
A fine and rare Swiss 18 carat gold open faced lever pocket watch with power reserve, circa 1910. Sold on November 27, 1916. Extra movement, lever escapement, 21 jewels. Cuvette inscribed. White enamel dial with Breguet hours, outer minute divisions, power reserve indication at 12 and subsidiary seconds at 6. Plain case, concealed hinged monogrammed back. Case, cuvette, dial and movement signed, case and movement numbered. Comes with an Extract from the Archives.
–
Diameter: 50 mm
–
Signed: Patek, Philippe & Cie Geneva Switzerland
–
This timepiece was awarded first prize by the Geneva Astronomical Observatory in 1915.
–
It is extraordinary to note that this watch passed the rigorous tests of l’Observatoire de Geneve in 1915. Testing at the Geneva Observatory initially lasted 40 days and required the watch to be tested in different positions and at varying temperatures to check its ability to maintain outstanding accuracy. Accuracy in timekeeping has been critical to advances in Science and, in 1873, the Observatory in Geneva held its first annual Chronometer competition. Patek Philippe won the much coveted 1st prize for the first time in 1884.