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DR Flugpost Holztaube. Briefmarkenbeschreibung de FlugpostMarkenserie Holztaube en airmail stamp series wooden dove Ausgabepreis Mark First Day of Issue Erstausgabetag April MichelKatalogNr Deutsches Reich scanned by NobbiP de Ernst Aufseeser copyright information PDoldauto PDtext PD in Germany due to age PD in US because