Hungary Souvenir Sheets. Group of better items on black stocksheets, including C81 sheets of 4 perf & imperf, 1975 Architecture B307-10 & B311 imperf sheets, 1973 Helsinki Europa imperf sheet, etc; owner's Scott catalog value $1,800, please inspect, o.g., hinged or never hinged. Estimate  $350 - 500. $0