50 Heller and 1 Kc. \"Masaryk with child\" with overprint \"we are free! Plus swastika\", on Envelope front with 1 Kc. And 2 Kc. With same overprint, cancelled \"Moravska Ostrava 1 ** * / 21. III. 39 / 3 I\", expertise Robert Brunel VP (2023) : \"the condition is perfect\", Michel 712.- for single stamps