Holmes Antiques has dated this 18th Century Mahogany Armchair to the 18th Century.

A fine piece of Irish country house furniture
Provenance
Montacute House, Summerset, collection number L/MON/F/134
On Loan to The National Trust from The Society For The Preservation Of Ancient Buildings.
The Chair was bequeathed by Evelyn Fitzgerald Stannus to the S.P.A.B in 1939. It is a real possibility that the chair was made for William Stannus of Ghan house, Carlingford, Ireland.
Holmes Antiques has dated this 18th Century Mahogany Armchair to the 18th Century.
Leading experts on early english oak, walnut and mahogany furniture. Established in 1932.
You can view the stock and full dealer information on the Holmes Antiques Profile Page