Teak chairs with large brass screw head detail?  

Saw this set of chairs at a local thrift. Looks like they might be teak underneath all the cigarette smoke. Coarse, almost burlap upholstery, seat pads attach with chrome snaps. Structural screw holes are plugged with dowels, large brass screw heads are part of functional bolts that hold the thing together. Metal tube in back has a brassy anodized finish. I thoroughly inspected every chair for marks, but didn't find the slightest clue.

Anyone recognize them? They appeal to me in a early-70s-library sort of way.
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