Thonet piano stool

Thanks to the adjustable piano stool screwed wooden retained the seat by a metal structure. The wood of the seat so that the ring holding the feet have moved with the times but no breaks, this stool is very solid, old sagging of the original varnish. RARE, etiquette (damaged) Thonet, original, is present under the seat. Height at the bottom: 45cm, base diameter: 37cm. Weight: 4, 2kg.