10 Heller postal stamp with bright blue green overprint "Karlovy Vary 1. X. 1938 ++ swastika", tied by first day postmark" X Karlovy Vary 1 X / - 1. X. 38" on letter piece, faultless condition, issued only 2.220 examples - with first day postmark especially rare, expertise Brunel VP (2020) : "the condition is perfect. ", Michel 500.-