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 1942 CDV9/II, response I. part from double PC Tiso 50h green, sent inlandly, uprated with stamp 20h Sy.49, posting special postmark BRATISLAVA/ CELOŠTÁTNÁ EXHIBITION POŠTOVÝCH ZNÁMOK 23.V.42; good condition