LUXEMBOURG, 1923 BIRTH OF PRINCESS ELISABETH SOUVENIR SHEET MINT NEVER HINGED, #151 var., long vertical perf. line, full normal irregular gum showing some natural cracking, very fine, signed F.S.P.L., with 1998 Demuth cert., ex. Perfectum, cat. $1,600.00, Michel Block 1 II @ €2,500.00