1858, 10 special Franz Joseph brown, in perfect condition mint never hinged, unsigned, in this preservation rare, superb in every respect (choice copy), photo expertize Ferchenbauer VÖB (for former block of four) "the stamps have full, fine original gum without hinge [. . . ]; it is a mint never hinged exquisite item! ", Michel mint never hinged listed and seeming also practically not offered!