3 d. On 30 Pfg imperial yacht, overprint defect \"numeral of value 3 in lieu of 4\", unauthorized (SG 2022 / p. 580 / memorandum) or authorized (Gibbs / p 270 / 6 a), unused with original gum, Gibbs page 270, Gibbs 6 a, certificate Eichele 2009, extraordinarily rare, very fresh and perfect condition, an interesting piece for a strong specialized collection the overprint issues! (former starting price 500)