Souvenir sheet "stamp exhibition Pressburg", stamp on field 8 without overprint, all the others items with inverted till slightly diagonal vertical overprint, used "Liberec / 10. 10. 38 / * day the liberation *", at the bottom on the right corner crease, signed Hamper and certificate with photograph Brunel VP (2014) : "the extreme scarce souvenir sheet. . . "; Michel 4. 500.- (undervalued, a single stamp appraises already 400.- added you this with the 24 values (one stamp without overprint) result in be 9. 600.-) - in the present form maybe unique!