20 Heller postal stamp with bright blue green hand stamp overprint \"Karlovy Vary 1. X. 1938+swastika\", tied by first day postmark \"Karlovy Vary 1. X. 38\" on letter piece, little irregular perforated, otherwise in perfect condition, issued only 2.815 examples - with first day postmark rare, photo expertize Brunel VP (2021), Michel 300.-