unusual wassily chairs  

Hi,I know there has been discussion on identification of the maker of authentic Wassily chairs, but here goes. Here is what I have.-Dead flat welded ends on the tubes.-chrome hex bolts, no lettering on them. recessed in nicely flush, not cheap punched holes into the tube.-Bottom joined area on leg tubes have three punched recesses to hold the spacer piece inside. No screws.-And, really heavy duty thick canvas/fabric straps in black. Sewn, no springs.So, does anyone know if they are Knoll, Gavina or other? I can't seem to find any like it with the heavy canvas straps.Please Help!Thanks