Here is the link to the Replacment.com page, to give you a ideal of overall value. Keep in mind these values are high end for those "with $$$" to find replacments for there set, The rest of us will use ebay and get it about half of that value. It Does not state the actual age they were made, but If I was to guess by style, I would not place it in the early century, but Early Mid in style.
