Hi Everyone,
I'm just starting to get into researching and collecting fine furniture/art, and came across a pair of these chairs which I believe to be Knoll Barcelonas. There are no markings on frames. The leather unzips in the rear, and on the top cushion there is a strip of ventilated / perforated leather.
The leather is pretty crispy, but it does appear to be leather on the inside of the zippered cushion. 
<img class="wpforo-defaul
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