Recently I featured this model 81 and a used one has been sold at Christies at March 04, 2008:
GEBRUDER THONET MODEL 81 ARMCHAIR
Price Realized £875 ($1,737)
Estimate £800 – £1,200 ($1,588 – $2,382)Sale 5337 modern design 4 March 2008 London, South Kensington
GEBRUDER THONET MODEL 81 ARMCHAIR
circa 1900, for Thonet, bentwood and cane 82cm. high
Via Christie’s