By Margaret Lyons
February 23, 2010 at 03:32 PM EST

A rare Superman comic book from 1938 sold for $1 million yesterday on ComicConnect, a consignment website. Intact copies of Action Comic #1, which marked the debut of the now-iconic Man of Steel, are exceedingly rare: Only about 100 copies remain, and of those, only two — including the recently sold one — are in good condition, according to the site. Both the previous owner and the new buyer remain anonymous.