Antique Oak Dining Chair

I have 3 Antique hand carved Oak Dining Chairs and I am uI ncertain of their value. They have been in my family for years, just not sure how long. My mother is 65 and they were in her dining room as a child. I do not see any screws or hardware holding it together, so my belief is that they must be pretty old. Any feedback or knowledge would be much appreciated!