Antique Chair with curved Cushion

This is an old chair with an unusual shape – it has continuous cushions from the arms to seat to back, no breaks. I have looked at over 2000 photos of chairs on eBay and other sites and have not yet seen one like it. It is not in really good condition; it has a dirt spot in the seating area, and one front leg was partially broken and repaired. The two casters on the front are stamped with “PATD FEB 13, 1894”, so I assume it is quite old.

 If anyone has any idea what style it is, and maybe a rough value, I would greatly appreciate it. It was going to be thrown out but I would hate to find out it was valuable.

Thanks