History of Aviation, Rare Stamps and Postal History of the World, Part 1
Lot 90:
1925 (April 12-13), Regensburg Easter Flight Festival, official postcard franked by Eagle 5pf green, cancelled by Donaustauf date stamp, semi-official air post stamp of 10pf olive is alongside, tied by official Festival marking, violet ”Mit Flugzeug. D409 befördert” is alongside, VF and scarce, Mi #15, €520, Est. $150-$200
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