The Ionian Islands stamp Scott #N1a from Italy, issued between 1941-1950, features an occupation stamp with a unique error - the letter "C" in Cephalonia is incorrect. This mint never hinged stamp is multi-color and in very fine condition, with a hand-stamped P/D in circle certification. This rare stamp is a collector's item due to its unique error and historical significance related to the occupation of the Ionian Islands.