A CGC Certified copy of Amazing Fantasy #15 with cream to off-white pages brought $6,600.01 on eBay after obtaining 21 bids. This Marvel Silver Age key featured the first appearance and origin of the Spider-Man and also the first apperance of Aunt May and Uncle Ben.
According to the the CGC Census there are 1,028 copies with the highest certified copy being three copies tied in 9.6.