It's like night and day when you see them side by side, isn't it? Do you see what we mean when we talk about the C pattern being centered? On most BUT NOT ALL Signature or Op Art C patterns, the right and left halves should be mirror images of each other.
There are quite a few C pattern styles such as Optics, Scarf Prints, Tartans and others that don't follow that rule, and quite a few exceptions even with the standard Signature C pattern like yours. But most of the time those Cs should mirror each other on the front and usually on the back too. That's why just one look at that seller's listing should set off alarm bells.
I hope you get your money back - just follow Ebay's instructions on their Resolution Center and in their messages, and don't let the seller talk you into any kind of delay. He's completely in the wrong here and sellers that don't authenticate highly-faked styles shouldn't complain if they get caught selling a fake.
BTW, did you know that you can report a counterfeit item being sold on Craigslist by clicking on the "Prohibited" link at the top of the page? I don't know how many they need before they remove something, but I've just made MY contribution.
(ETA - Should have read the comments by BeenBurned first)
