The year is 1959, a single issue marking the 30th anniversary of the Polish airline 'LOT'.
It is Scott number 863 / SG 1109 Issued 1959. Kim
Hello, I dont have a Scott catalogue, but here s what I did find: Polen Serie: 30th anniv Polish airlines Katalogno:Michel PL 1115 Yvert et Tellier PL 980 AFA number PL 1004 Polish Stamps Catalog (Fischer) PL 971 Tema: Issued: 1959-08-24
Thank you very much for your kelp !