50 Heller "stamp exhibition Kaschau", vertical gutter pair with besides rarer magenta in lieu of dark-rosa hand stamp overprint "Karlovy Vary 1. X. 1938 plus swastika", perfectly mint never hinged, issued only 118 gutter pairs, expertized Mahr BPP and photo expertize Brunel VP (2022) : "the condition is perfect. ", Michel 450.- plus