Original? $50 U.S Mint Proof Liberty Eagle Ebay listing

I think this coin is fake, mainly because no one has showed interest in bidding. But still I'd like opinion of learned members.

http://www.ebay.in/itm/171202525665?ssPageName=STRK:MEBIDX:IT&_trksid=p3984.m1426.l2649#ht_4075wt_973

So far I have found difference in word 'Platinum' and little mark (Mint mark?) near hairs of Liberty. eBay listing doesn't have that mark.

Please advise.

Thank you.

The advertiser has given you the option to ask questions to clear your doubt so you should ask them, as you do have a guarantee through ebay as a buyer, we can advise good or bad but no guarantee. I hope this helps you make your choice.

what's fishy is it says Platinum Marked. Marked?  Marked with the word Platinum? Hmmm

"Silver Coin!!"