Patek Philippe First Class Observatory Chronometer
Very fine and very rare First Class Patek Philippe 18K gold Observatory Chronometer
circa 1916 with observatory papers.
Highest quality 20 jewel 8 adjustment Extra movement (insignificant spots) with
two serial numbers, and with Guillaume balance with platinum and gold timing screws.
"Extra" quality watches were specially adjusted by masters who were the highest
paid workers in the watch industry. These watches were made to the highest
possible standards and were several times more expensive than the regular
production. Only the very best of these watches were selected for observatory
trials, and only the very best of these were awarded First Class certificates.