Antique Furniture Direct has dated this piece to the Regency era.
The drop-in seat has been fairly recently upholstered in a red leather. Solid and sturdy, it would make a wonderful desk chair.

This chair was purchased from York Minster, and was in St Williams College. Founded in 1460, St William’s College is a Mediaeval building in York, England, originally built to provide accommodation for priests attached to chantry chapels at nearby York Minster.

Construction/Wood:
Mahogany
Condition Report:
Solid and sturdy, recently upholstered in red leather. Good colour and patina. A well-executed solid old repair to the leg. Other wear and marks commensurate with age.
Dimensions:
Width: 57cm
Depth: 50cm
Height to seat: 45cm
Height to Arms: 71cm
Height: 85cm
Antique Furniture Direct has dated this piece to the Regency era.
You can view the stock and full dealer information on the Antique Furniture Direct Profile Page