The chairs have labels from the Rockford Furniture Manufactures Association. There are six chairs one of which has arms. The manufacturer appears to be the Standardized Chair Company. The table has three leafs and a latch with the Seng Co Chicago printed on it and a tag that has the number 457 hand written on it.
It was purchased at an estate sell.
Its a nice set of furniture in typical American post ww1 style and its made in better quality than a normal furniture today but its not the most popular style for the moment. If you want to sale it, a local auction house would be the place.