This is the reason I told Brian I don't collect Mobil toppers..... I have two, and I've had them both for over 10 years. I bought one in a local antique shop, and the other was a gift. It was certainly used as it isn't a minty example. At any rate, the one I purchased years ago looks like Brian's. I thought it was good but must be it isn't. I do believe though that the one Peter posted is a different version. I know there is a guy that produced a collector's guide booklet on Mobil toppers specifically that appears on Ebay every so often, and if I remember right there's like 50 different versions out there. I can't remember the exact number, but it was a helluva lot more than I was aware of.
At any rate, due to the repros this has been an area of collecting that I've stayed away from.