London City Antiques has dated this piece to the 18th Century.

An exquisite 18th century pair displaying first class design and quality throughout.
Dimensions:
Height 88.5 cm (34.84 in)
Width 94.5 cm (37.20 in)
Depth 53.5 cm (21.06 in)
Back to front side measurement 66 cm (25.98 in)
Dated 1780
London City Antiques has dated this piece to the 18th Century.
At london city antiques we specialise in fine english antiques
You can view the stock and full dealer information on the London City Antiques Profile Page