Chair spotters, help! I'm looking at what appears to be a B33 -- chrome tubing, thick leather sling seat and back. Leather is a light, warm gray in color, reinforced on the underside of the seat with a black, treated fabric of some sort. The two curved metal stringers between the tubes under the seat are each equipped with a little tubular sleeve-gadget on one end. Twisting the sleeve thingie tightens or loosens the fit of the curved stringers. No visible seams in the chrome tubing. No maker's mark. Any way to tell if it's Knoll, Thonet, or Knockoff, and how old it might be? The link shows pretty much what I'm talking about. Thanks!
http://www.designmatcher.com/nl/gallery_detail.php?designersID=101&queryID=1&galleryID=81
Or maybe Mart Stam?
But chair was discovered in a U.S. rust belt city, so more likely Knoll?
http://designffm.de/artikel/353/Thonet_Mart_Stam_Stuhl_S_33.html
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