Souvenir sheet issue \"Bratislava 1937\" with handstamp overprints \"Karlovy Vary 1. X. 1938+swastika\", variety \"overprint inverted on 50 Heller\", mint never hinged, full original format, faultless condition, issued only 144 examples and with of this variety only so far 2 examples known, expertized Mahr BPP as well expertise Robert Brunel VP (2023) \"the condition is perfect. With inverted overprint on the 50 Heller value is up to now only another copy have become known. \" - the other copy obtained in 2021 a hammer price from 11.000.- Euro on the 175. Felzmann auction.