35 C. Postal stamp with overprint error I " composition error 'a' in lieu of 'n' in 'occupation' " (only on field 17 occurring), in perfect condition unused, extremely rare, expertized Diena and photo expertize Brunel VP (2017) "the stamp has authentic overprint in of the type II and original gumming. . . . The condition is perfect. The edition the variety was only approximate 26 examples. ", Michel approximate 2.500.-