Cross Antiques has dated this piece to the Victorian era.
The dial is signed for Mills, Dowlais.

It's unusual to find a brass dial clock of this period (1840) so I can't guarantee all parts started life together but there are no obvious signs they didn't.
The 8 day movement strikes the hours on a bell and it has a smart brass dial with subsidiary seconds dial and date indicator.
The maximum dimensions are:
212cm (83.5") high
51cm (20") wide
24cm (9.5") deep
Free local delivery and setup (40mis), national delivery arranged at cost.
Cross Antiques has dated this piece to the Victorian era.
Specialist in clocks
You can view the stock and full dealer information on the Cross Antiques Profile Page