Poland 1928. COVER. Yv. 5, 8. 10 g green and 30 g carmine. Airmail from WARSAW to BARCELONA. On the front postmark 1-VOL POSTAL / WARSZAWA-BARCELONA, in red and arrival on the reverse. VERY FINE AND RARE.
Poland 1928. COVER. Yv. 7(2). 20 g olive,two stamps. Airmail from WARSAW to MADRID. On the front postmark I VOL POSTAL / WARSZAWA MADRID, in pink carmine and arrival on reverse. VERY FINE.