Worboys Antiques has dated this piece to the 1860s.

Dimensions
17.00cm high 10.00cm wide 9.00cm deep (6.69 inches high 3.94 inches wide 3.54 inches deep )
Provenance
Achille Brocot (1817–1878) was a French clockmaker and amateur mathematician.He is known for his discovery (independently of and contemporaneously with German number theorist Moritz Stern) of the Stern–Brocot tree, a mathematical structure useful in approximating real numbers by rational numbers; this sort of approximation is an important part of the design of gear ratios for clocks.
Current Condition
The brass case has been polished and is lacquered so it will not tarnish. The movement has been serviced in our own workshops and is guaranteed for 12 months.
Worboys Antiques has dated this piece to the 1860s.
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