Swiss important heavy observatory chronometer Circa 1875

Open faced gold pocket chronometer watch by Patek Philippe
–
A Swiss important and heavy Patek Philippe pocket watch chronometer, a so-called observatory chronometer, with cylindrical hairspring and extract of the archive, circa 1875.
18-carat gold à goutte case with a gold monogram on the back and signed Patek Philippe & Co. Genève; exquisite and rare quality chronometer movement with cylindrical hairspring, golden wheels, wolf’s toothing, big chronometer balance with gold screws and moustache lever; white signed enamel dial with Roman hours, Arabic minutes, sunk subsidiary dial with Arabic seconds and fine steel hands. This important watch is a rarity; it is in good condition and working order.
–
Diameter: 53 mm
–
Weight: 135 g
–
Signed: Patek Philippe & Cie Genève
–
Patek Philippe produced only a few pocket watch chronometers with this observatory calibre, a few with lever escapement and a few with spring detent escapement. This special edition with golden wheels and cylindrical hairspring was probably made for the English market. A comparable chronometer from the same year was sold in a Geneva auction.