With Patek Philippe Extract from the Archives confirming production of the present watch in 1989 and its subsequent sale on October 20th of the same year.
Further accompanied by a Patek Philippe Certificate of Origin dated November 9th, 1990, presentation box, operation manual, and outer packaging.
To the best of our knowledge this clock has never before been offered in public.
Patek Philippe opened its Electronic Division in 1948 with the goal of exploring photoelectric, electronic, and nuclear timekeeping. The department produced the groundbreaking solar clock, the first of its kind. The first dome clocks produced in the 1950's and 1960's came with a mechanical caliber 17''' pocket watch movement, wound by an electric winding device.
In 1955, the solar-powered photoelectric clocks were exhibited at the 1955 World Symposium, and displayed at the Museum of Science in Boston, Massachusetts. In the 1970's, Patek Philippe began using quartz technology in its clock production, and began phasing out the use of solar versions. These "Dome" clocks are highly collectable, and often feature a unique and individually decorated case, featuring cloisonné enamel scenes. These clocks also feature a circular brass dial, engraved Roman hour markers, lighter skeleton hands that replaced the heavier "Dauphine" hands featured on earlier clocks with mechanical movements.
Towards the end of the 1940's, the Swiss watchmaking industry began using the technique of cloisonné enamel. This technique uses fine bands (filaments) of gold or copper to outline the design subject, which are then soldered to the surface of a plate. The empty spaces are then filled with ground enamel and fired multiple times so that the surface becomes perfectly level.