1939 Sy.D3Xz production flaw, the first issue 20h blue, smooth gum, vertical pair with production flaw - 2x vertical hair paper crease in paper; mint never hinged, interesting 1939 Sy.D3Xz production flaw, the first issue 20h blue, smooth gum, vertical pair with production flaw - hair paper crease; mint never hinged, interesting 1940 Sy.48 VV+ 51 production flaw, Tatra I. 10h without watermark, block of four with production flaw - double impression + 30h with wmk, vertical pair, upper stamp. with oblique paper crease; 2x minor gum fault, otherwise mint never hinged, interesting
