Interesting pocket for Chinese market watch with rare escapement.
Watch is based on typical, richly engraved Fleurier calibre, but equipped with extremely rare LEVER-DUPLEX escapement.
Diameter is 55mm.
Lever Duplex Escapement
is described in details in article "Seconde morte et echappement ancre duplex" (dead-bit seconds and lever duplex escapement) by Y. Droz and J. Flores, in Revue N 37 of French Society of Antique Horology.
The point of lever-duplex was to create detached escapement, while keeping the dead-bit seconds. As you know, the conventional duplex escapement is frictional rest one, while lever escapement release the train several times per seconds.
The lever-duplex escapement takes the best of two worlds, making detached escapement with dead-bit seconds naturally.
The authors doesn't answer on question of origin of the escapement.
They mention that already in 1838, Frederic HUGUENIN presented similar escapement, that was mix of lever escapement and Robin escapement. They drive development further to works of Pierre Le Roy of 1760s.
But there is no answers on question of very this variation.
Chamberlain book presented the sketch of Lever-Duplex escapement and mentions Fleurier village, but doesn't mentions the date.
The very this watch looks like as Fleurier production of 1860-1880s, with it's distinctive engraved movement.
The dust cover bears engraving "Ancre Duplex" for Lever Duplex.
Comparable watch by Bovet from Fleurier was sold on Dr. Crott auction of May 2018 for 3800 euros + auction house fees (auction N 97, lot 192).
The watch appears to be in quite good condition.
The movement functions, though time keeping is not guaranteed.
Dial is free from defects.
Case has common period wear.
Item is not available