The second world peace congress in Warsaw.
(lithography by Pablo Picasso)
II światowy kongres pokoju = Second world peace congress.
The dove of peace of also depicted on the following Polish postage stamp issues:
Fischer XX (not issued due to currency revaluation)
Fischer 548 (45 groszy overprint of Fischer XX)
Dove - symbol of peace (by Carol Sabbeth at members.aol.com)
World Peace Congress