It can't be real 4 in existence need opinion.http://cgi.ebay.com/VERY-RARE-1849-C-LIBERTY-GOLD-DOLLAR-XF-TYPE-I-X1_W0QQitemZ130345284888QQcmdZViewItemQQptZCoins_US_Individual?hash=item1e592f3518#ht_1434wt_939
That is an 1849-C closed wreath and there are 11k+ of them minted. The one you're thinking of is the 1849-C open wreath of which there are 5 known. One just sold at the Long Beach auction for $200k+ and I held it in my hand and checked it out during lot viewing, very cool!!! Would rather have a true rarity like that for that price vs. a fake coin never intended for circulation like the 1913 Liberty Nickel with the same mintage but a much bigger price tag.