LVS Decorative Arts has dated this piece to the 1860s.
These are low hoop-back windsor chairs with a wheel design middle splat.

They have a turned H stretcher & bobbin-turned legs on each chair.
Chairs such as these were mainly made in the Thames Valley, possibly High Wycombe.
Size:
Height: 35'' / 89cm
Width: 15'' / 38cm
Depth: 18'' / 46cm
LVS Decorative Arts has dated this piece to the 1860s.
You can view the stock and full dealer information on the LVS Decorative Arts Profile Page
LVS Decorative Arts is a registered member of LAPADA CINOA