Opening of an airline on the route Gdynia-Warsaw-Venice-Rome, airmail letter sent 14.6.39 from Warsaw to Rome; additional stamps: "14-VI-1939 OPENING OF THE GDYNIA-WARSAW-VENICE-ROME LINE" and "1919-1939 XX YEAR OF POLISH AIR COMMUNICATIONS 14-16.VI.1939 GDYNIA"; receiving date stamp on reverse.
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