User blog comment:Carlos2295/Finally Won a Cel on eBay/@comment-224939-20171015191115/@comment-5290974-20171017133916

It's a season 1 cel, so there may have been a different issuing authority then. The little logo on the cel also says "Cartoon Network Cartoon Cartoon." Technically it is a Warner Bros. cartoon. At least one DVD I found was issued by them.