If you are in the UK that explains a lot !! They are probably hall chairs !! Back in the 70`s and 80`s when antiques were bringing fair money many dealers imported shipments of English antiques to the U.S. !! I had a shop at that time and bought many pieces here !! I have seen similar chairs although not exactly like yours !! I would call them Gothic Revival and they would date about 1900 or a bit after . Your wood looks like walnut which was commonly used for chairs because of its strength and durability !! They should not be difficult to restore however the fabric would be more difficult to guess !! If I were restoring these chairs,, I would use a fabric with an English hunt scene !! If you want to stay with the period and the feel of the chairs,, Don`t use florals or frilly material !! Imagine a hunting lodge !!