It's strange because I only have the one along with 3 sets of the postcard series. I don't remember the series off hand but I think it was series 2. It's funny seeing the cigarette by the wrapper. Very taboo to Topps, even on an advertising card. I also don't know the story behind the 'Powered by Ebay' thing.
I have two of the cards, not sure whether I got them with series 2 or series 3, but it's more likely series 3, since they were loose in the shipping box(es), and I bought series 3 in two separate orders. It's an ad for Topps Vault, so I figured the 'Powered by ebay' thing is because that's where the Topps Vault does their auctions. It's a very nice looking ad card!
Just a thought for your auction, you might want to consider showing a pic of the reverse, and also including it in a sci-fi category. It's got some really cool characters - you can't go wrong with Martians, Captain Kirk, the Enterprise, and Apes all together!