Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 729:
1945, black surcharge ”20” on Postage Due stamp of 10f brown red, watermark Double Cross on Pyramid (IX), surcharge type 5 under 36 degree angle, full OG, NH, VF and rare, only 12 stamps were surcharged, expertized by Dr. Blaha, C.v. CZK98,000, Majer #U107a
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