Souvenir sheets issue stamp exhibition Praga with centered special cancel "Liberec / day the liberation 10.10.38", the standard size at the upper sheet margin about 2 mm fallen short of, otherwise in perfect condition, very rare souvenir sheet, issued only 300 piece, new photo expertize Brunel VP (2018) "the souvenir sheet has genuine handstamp overprints from Liberec and mint never hinged original gumming. The special cancel is likewise genuine. ", Michel 2.000.-