Well,, The COA is no real selling point !! Basically that letter would be with all their reproductions like this !! It isn`t significant !! That wouold be the same as all the COA`s that go with the Franklin Mint repros !! However there is a good collector base for these cannons !! You can end the Ebay listing by going to your My Ebay page,, to the right of the listing you will see More Actions or something similar with a drop down menu, click on that and in that list you can find "end listing" just click there and fill in a reason for ending it and follow any other prompts !!