50 Heller stamp exhibition Pilsen with hand stamp overprint "Karlovy Vary 1. X. 1938 plus swastika" in the horizontal gutter pair with overprint also on the ornamental field, with cancellation adjusted date stamp Karlovy Vary 1 4. X. 28 4 d on faultless blank cover, expertized Osper BPP, abridged certificate with photo Brunel VP (2018) "perfect", Michel 600.-