How old is this table and chairs Pattern f9554 Finish 49 Rumford y4 Tell City Chair Company Indiana manufactured it.?

i have a set of 4 dinning chairs made by Tell City Chair Company Tell City Indaiana the description is as follows; Pattern: 4800, Finish: Walnut 30, Cover: 77, handmade french embroidering, I just want to how old they are, the set is in Excellent condition and there are four chairs, very beautifully carved wood backs, nice detail workmanship.