I have just added these two fabulous Mid-Century Modern Mushroom Chairs to our Booth at the Livingston Antique Outlet (Booth #80) 1825 N. Burkhart Rd., Howell, MI. The maker is unknown but I do know that a company in Owasso, MI did make this type of chair. The bases are molded plastic and the seats are padded and upholstered over a fiberglass shell. After some restoration these chairs will be showstoppers. Check them out today because they won’t be there long.