50 Heller "stamp exhibition Pilsen", horizontal gutter pair with dark-rosa hand stamp overprint "Karlovy Vary 1. X. 1938+swastika", cancelled "Karlovy Vary 1 4. X. 38 4 d" on letter piece, faultless condition, issued only 110 gutter pairs, expertized Dr. Dub and expertise Brunel VP (2021) : "the condition is perfect. ", Michel 600.-