30 Heller postage due stamp with overprint "Karlovy Vary 1. X. 1938 plus swastika", corner margin piece lower left with plate number "2", used" plus Karlovy Vary 1 plus / 4. X. 38" 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. "