Question: what is an ebay 1/1?
Answer: in the set? SO in all reality EVERY serial numbered card on Ebay IS a 1/1 because there isn't another 21/100 in that serial numbered set nor is there another 49/100 or 1/100 or 100/100. So stop usings Ebay 1/1 tags, every serial numbered card is a 1/1.