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1928 SOFIA - BERLIN, Registered airmail letter to Germany, franked with i.a. 1st airmail issue, stamps with Opt, Mi.206-209, CDS SOFIA 10.9.28, transit WIEN FLUGPOST 11.IX.28, air-mail frame red cancel. BERLIN C.2. and on the back side arrival BERLIN C 11.9.28; only vertical light fold in envelope, sound U:A5