Antique Chair-Appraisal needed

I recently obtained a chair that belonged to my great-grandmother and I was hoping to see if you could assist me in providing any information on the item and/or the approximate value. There are no screws or nails, it's only constructed of wooden dowels and wooden wedges. The wedges are where the legs meet the seat to expand the leg piece into the seat piece. The chair back has leather that wraps the front of the chair-back, around the top edge of the chair back. The leather is attached via decorative thumbtack-style pieces. The chair back itself is attached to the chair-back uprights buy actually being inserted into the two uprights. There's no name of manufacturer, just 2 sets of numbers that I photographed. (3991 is stamped into the bottom of seat and just below that the numbers 5-379 are stamped) The back itself is one solid piece where the craftsman hand carved a design using what I guess was a chisel, in a floral-like pattern. There are spots between the hand-carved pattern that go entirely through the back, which you'll see from the pics as well. I appreciate your assistance and look forward to hearing anything that you may know about this single chair. I do not have a set, just the one.

Thank you