Mid 20th century.
Dining room sets were not made in the 15th, 16th, 17th or pretty much any century until the 19th, and the golden age of matched dining room furniture was in the mid 20th. Mart may be right; these may very well be 1970s.
That's by best bet !!
You know the seller may not have known either, but bought them believing the dealer that sold them to her !! People don`t always intend to be dishonest !!
Just wait and get additional pics !!
