ost English-speaking stamp collectors would nowadays recognize the phrase as referring to a famous printing error discovered more than a century ago by a customer at a US post office. We all dream of stumbling upon such a find because they have occurred throughout the entire history of postage stamps all over the world since 1840. Much less spectacular than an inverted centre, admittedly; but missing perforations, or a missing ink colour, or an incorrect value, all qualify as errors that would induce an adrenalin flow in any stamp lover. I have never had the good fortune to find an error worth so much as a drip of perspiration. The
