Elmgarden has dated this piece to the 19th Century.
The chairs have original patterned pressed plywood seats and double hooped back rails, they are genuine Thonet chairs and are labelled

This very attractive set is quite a dark colour, which is original, they have not been stripped and are sturdy with no splitting
The chairs are 35” high at the back, and the seats are 16” in diameter and 19” from the ground
DL156
Elmgarden has dated this piece to the 19th Century.
You can view the stock and full dealer information on the Elmgarden Profile Page