These chairs seem Gunlocke Risom like. I believe them to be American. The bottoms of the legs look grey. They look like they were in a moist basement. They have a cool look. I would be in the $300-$450 range on look alone, but if the feet are punky I would bow out.
I spoke with the owner on...
I spoke with the owner on the phone and have made an appointment to take a look tomorrow. He says they are in fact by Risom. Am a little dubious. Any way to determine? He says the chairs were lately reupholstered and is asking $1,200.