Cross Antiques has dated this piece to the 19th Century.
Surrounding the dial is a pierced and gilt brass mask.

I would think it dates from the 19th Cent and is generally in good condition. There is a small piece of molding missing from the base. The movement runs for a few seconds (balance looks OK) but it probably needs a clean.
The maximum dimensions are:
51cm(20") high
14.5cm(5.75") wide
8cm(3") deep
Free UK Delivery
Cross Antiques has dated this piece to the 19th Century.
Specialist in clocks
You can view the stock and full dealer information on the Cross Antiques Profile Page