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.-