Never, never, never,never, never,never,never,never,never,never,never,never,never,never,never,never,never,never,never,never,never,never,never,never,never,
I get most of my coins on ebay, you just have to know what you are looking at and be careful of who you buy from.
I'm a Virgo! I'm too old to keep up with all the slang you kids use. Besides 490 in Roman numerals, what does "XD" mean?
I went and looked at the eBay auction and there are several things that concern me. First off...I don't see anything with the coin that screams fake. But, when I look at the photos in the auction I see two things. They are either blurry or the contrast is funky. You never get a good look at any of the surfaces. I suspect that if this coin is authentic, it's got a ton of problems. I also looked at the seller who has a feedback rating of 141. If you look at his completed sales you see a lot of collectible stuff (magazines, model cars, Elvis memorabilia) but no coins. So, we have a valuable raw coin with poor photos on eBay from a seller who has all positive feedback but no history of selling coins. For me, that's too many red flags. I wouldn't take the chance.
I contacted the guy and offered an opinion and suggestions. He replied he would take it down and get the coin checked out. The ball is in his court.
Considering the prices of 55/55's, they should ALL be considered fake unless in a slab. Only the most experienced collectors should ever buy raw key date coins IMO. I've seen a million and one noobs make big mistakes (and I've made a few myself) - it's just NOT WORTH the chance. Even if you can get your money back through ebay's guarantee, they can't refund your time, frustration and hassle.