He sold it to a collector in Dallas for $492,000.
In August, I wrote a post on how to tell a genuine copy of Action Comics #1, the 1938 debut of Superman, from the near-identical Famous First Edition reprint from 1974. Since Detective #27 was also reprinted in that series, I'll now tell you how to pick it out of a line-up.
Again, the most obvious difference is size. The original 1939 comic book measured about 10 by 7.5 inches, slightly smaller than a sheet of letter-sized paper; the 1974 reprint was 13.5 by 10 inches, a little bigger than a modern tabloid newspaper.
The Famous First Edition series was a great gift to young collectors who never knew what comics were like in the early days. But they can also be a gift to thieves and con men. Don't get taken in by a defective Detective.