Identify rush seat brace back spindle chair

I am trying to identify who made this chair and approximately how old it is. My daughter bought 4 of them at Dixon's Auction in Crumpton MD. I can't find any markings on them except for the number 532 stenciled in white on the bottom of each chair seat. The wood appears to be mahogany. The closest thing I could find was a chair sold by John Wanamaker's but it only had 4 spindles and 2 brace spindles. This one has 5 and 2 and seems a bit more delicate looking. I was going to try to refinish them if they are valuable enough to make it worth my time and effort. Any help would be greatly appreciated.