among the gems : a mint condition 1853 cape of good hope stamp , which were first ever printed in the entire continent of africa , known to fetch about 50 grand apiece ; a chinese stamp from the 1960s which has an incorrectly drawn map and was pulled within a day , selling now for a cool $ 500,000 ; and , most impressively , a four block of the infamous upside down airplane that even a novice such as mike is remotely aware of having seen before , last auctioned somewhere in the neighborhood of a few million .