50 Heller postal stamp in the horizontal tete-beche pair (!) with bright blue green hand stamp overprint "Karlovy Vary 1. X. 1938 plus swastika", actual should the overprint on this stamp in dark rose result - it is a colour error, cancelled "Karlovy Vary 1 4. X. 38 4 b" on piece, few slightly spotty perf tips, expertise Robert Brunel VP (2022) "the other condition is perfect. With the overprint in the colour error is the stamp extremely rare and lies as tete-beche for the first time before. ", Michel not listed, a single stamp with overprint in colour error on piece obtained on our 179. Auction already 1.900.- Euro