unused Austria, 1918, 7k on 10k Air Post, imperforate (Sanabria no. 7a), B. margin single, lightly hinged, very fine , violet backstamp at extreme B. of margin which barely shows on front, Scott retail $400.00est.
unused Austria, 1918, 7k on 10k Air Post, imperforate (Sanabria no. 7a), B. margin single, lightly hinged, very fine , violet backstamp at extreme B. of margin which barely shows on front, Scott retail $400.00est.
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