4, 50 Fr. Dark bluish green with right attached blank field with printing machine number always with overprint "fortress Lorient" - this on the blank field inverted and additional a further inverted overprint over stamp and blank field going, unused with original gumming, edition with blank field only max. 10 pieces, as is probably the only one exists! Photo expertize autumn VP (2018) : "in the upper Perforation area of the stamp small thin affixed spot is existing, therefore as unused short attests. The other condition is perfect. " - very scarce variety the anyway rarely stamp with an edition from only 100 copies!