Tom Scott Antiques has dated this piece to the 1880s.
You can hang the mirror as you see it here "portrait" or "landscape" to suit you.

Beaded and reeded frame with ribbon mouldings and a gilt finish that has aged gracefully.
Not a heavy mirror, so it will hang on a secure screw fitting and the chain.
Measuring:
35” or 89cm x 29 1/2” or 75cm
2” or 5cm deep frame
Tom Scott Antiques has dated this piece to the 1880s.
Specialist dealer in french & english decorative furniture and interiors
You can view the stock and full dealer information on the Tom Scott Antiques Profile Page