Inverted stamps expected to go for millions – Philadelphia Inquirer
Inverted stamps expected to go for millionsPhiladelphia Inquirer, PAAP These, of course, aren't just any mistakes: They are the very valuable variety that happens when part of a stamp is printed upside-down. The collection amassed by Pittsburgh stockbroker Robert H. Cunliffe, who died last year at the age of 83, … More: continued here