Worboys Antiques has dated this piece to the 1850s.
It has an 8 day movement that strikes the hours and halves on a bell, and is numbered and stamped by the maker. It has its original invar pendulum.

Leon Pontanie is listed as working in 1851.
Current Condition
The case in in perfect original condition and finish, the movement has been fully serviced and is guaranteed for 12 months. If you would like a video clip of this clock striking please email us.
Dimensions
28.00cm wide 39.00cm high 16.00cm deep (11.02 inches wide 15.35 inches high 6.30 inches deep)
Worboys Antiques has dated this piece to the 1850s.
Established since 1978, dealing in and restoring most antiques, specialising in clocks and furniture.
You can view the stock and full dealer information on the Worboys Antiques Profile Page
Worboys Antiques is a registered member of LAPADA