This is a vintage/antique ebonised bentwood and plywood chair by Thonet - this particular model has an unusual leg configuration - they're in the wrong corners - and is, I believe the very rare Model 47 made around the turn of the (19/20th) century until around the 1920's.

Measuring 80cm tall, 50cm wide with a chair height of 46.5cm and a circumference of 41cm this particular chair has the Thonet paper label as well as the stamped/engraved signature to the bottom of the seat.

Postage/courier for this should be around £50 - subject to postcode and buyer preference.