Antique Wicker Round Back Chair

I have searched for info on this chair...I cannot seem to find another like it or even similar to it anywhere! It is white wicker, it all appears to be all original but I could be wrong on that. Under the cushion is two small about 1 inch pieces of wood that form an X....rather than like a flat seat/board. Cushion just sits atop it. Any info is much appreciated!