France Michel 17ND k used, 1862 reprint of the 1 fr Napoleon imperforated tête-bêche pair. With good margins all around and bearing a posthumous cancellation, accompanied by a 2007 Roger Calves certificate of authenticity. The certificate mentions that the cancellation is "apocryphe", meaning of doubtful origin/authenticity. Only 40 tête-bêche pairs were re..