Gdansk, 1939, Sonderpostwertzeichen from occasion the foundation one Landesarbeitsgemeinschaft in the free city of Gdansk to the combat the Geschwulstkrankheiten 29. April 1939, Fold commemorative leaf with matching Michel no. 306 / 09 and special cancellation Gdansk 5. 5. 39, condition I-II, rare, RR!