30 Heller postage due stamp with overprint \"Karlovy Vary 1. X. 1938+swastika\", corner margin piece lower left with plate number \"2\", used\"+Karlovy Vary 1+/ 4. X. 38\" on on piece in outstanding quality, issued only 237 examples - of it only a few pieces with plate number ever possible, expertized Mahr BPP and photo expertize Robert Brunel VP (2023) : \"the condition is perfect. Pieces with plate number are rare. \"