50 Heller stamp exhibition Kaschau with hand stamp overprint "Karlovy Vary 1. X. 1938 plus swastika" and right attaching, likewise overprinted margin field, with cancellation adjusted date stamp Karlovy Vary 1 4. X. 38 4 d on faultless letter piece, expertized Dr. Hoerr and Mahr BPP, abridged certificate with photo Brunel VP (2020) "perfect", by Michel without valuation