Swiss silver open faced keyless lever deck watch Circa 1914

Silver deck watch with Guillaume balance
–
A Swiss silver open faced keyless deck watch made by Patek Philippe in Geneva, circa 1914. The Quality Extra jewelled nickel lever movement with a Guillaume balance, wolf tooth winding and precision regulation. Silvered dial with Arabic hour numerals, an outer minute track, subsidiary seconds at 6 o’clock and blued steel spade hands. The plain polished case with a silver cuvette. Case, dial and movement signed.
–
Diameter: 60 cm
–
Signed: Patek, Philippe & Cie Genève
–
Comes with an Extract from the Archives confirming the movement was made in 1914 and encased in 1941.
–
This fine and important chronometer watch is equipped with the precision Guillaume balance. Charles Édouard Guillaume (1861-1938) was a Swiss physicist who received the Nobel Prize in Physics in 1920 for recognition of the service he had rendered to precision measurements by his discovery of anomalies in nickel steel alloys.