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.-