Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Germany - 1933, Graf Zeppelin Flight to Century of Progress Exhibition in Chicago, black overprint on 1m carmine, 2m ultra and 4m brown, two with imprinted margins, full OG, stamp of 1m with minor offset, NH, VF, C.v. $3,250, Mi #496-98, C.v. €4,300, Est. $1,500-$2,000, Scott #C43-45