German States, Hamburg, Michel 18, Scott 21, used.  1864 9s yellow Numeral, 4 line bar cancel, fresh, bright & well centered for issue.  A rare stamp, signed "Müller-Mark" (Berlin), and accompanied by a 1989 Jakubek Certificate.  2015 CV: $2,000.00.  2012 Michel CV: €2,600.00.