This cover is from my collection
On the left, Two Lables:
Shipping balloon On International Philatelic Exhibition-
TEMATIKA – POZAN 1968.
Stamping: transported balloon - Mexico-1968
On the left bottom:
Balloon Flight
the occasion XIX Olympic Games Mexico
Poznan, 11.VIII.1968 years
PFA Poznan 38/68 Issue 8000 pcs
PFA = Polish Philatelic Association
Thanks to Kazik Poland for translated to English
