Swiss silver extravagant Ankerchronometer watch Circa 1877

Open faced silver pocket watch by Patek Philippe
–
A Swiss extravagant and very early Patek Philippe Ankerchronometer with a rare 2/3 main plate with extract of the archive, circa 1877.
Original silver case, engine turned, reeded midsection, matching number 58055 on case movement and dial, dome signed and numbered. Very rare and early Ankerchronometer movement with very big chronometer balance, very rare 2/3 main plate and decorated. White enamel dial in perfect condition with Roman hours, sunk subsidiary dial with Arabic seconds and blued steel hands.
–
Diameter: 50 mm
–
Weight: 84 g
–
Signed: Patek Philippe & Co Genève
–
The extract from the archive confirms the originality of the watch.