10 Kc. Airmail stamp with overprint "Karlovy Vary 1. X. 1938 ++ swastika", neat cancelled "x Karlovy Vary 1 x 4 d -4. X. 38" on letter piece, issued only 20 examples - one of the large rarities the Sudeten territory philately, photo expertize Brunel VP (2016) : "the condition is perfect. "