Lot of 4 chairs Viennese bistro Thonet No.20 called "omega" Wood-curved

Lot of 4 chairs. Tuna no. 20 so-called "omega" dated 1870/75 - chair 20 is the third model of.tuna by the quantity produced, behind the number 14 and 18. The cannages are manual, new, with six wires, 1.8mm and 2mm crossed. Very good original condition. Chairs under organic gum-lacquer, your average walnut. Hollow stamp on each piece and first label (1b) altered, only on a chair. Seat height: 47 cm diameter: 41 cm height- total: 90 cm. More photos and information on request. Parcels france, europe or kidnapping. Alsace.