Age, maker & worth of these chairs?

These barrel back chairs that were given to me, were around a game table on a yacht. I have used as side chairs and dining chairs. There are four of them; one of them needs a leg repaired that has separated from the seat base, but is not damaged. The bottom of the seats show that they have been reupholstered many times. Does anyone know how old are they, who made them, and what would they be worth now?