Vicky Thomas Antiques has dated this piece to the 19th Century.
The dome comes in a great used condition with the slight scuffs and surface wear that you would expect from an object of this age.

The glass is bright, shiny and free from cracks, but has a few miniscule nibbles on the base of the glass which are completely unseen when it is in position on its wooden plinth. On the underside, the base has three feet lined with velvet.
Please see the photographs, and don't hesitate to get in touch if I can provide any further information.
Vicky Thomas Antiques has dated this piece to the 19th Century.
You can view the stock and full dealer information on the Vicky Thomas Antiques Profile Page