1851 9kr black Numeral Imperforate on Thin Blue Green Paper Error of Colour Forgery, tied to a small piece by a 4-ring numeral #87 (Mannheim), with expert signature and handstamps on back of stamp, which has been removed from piece and placed back with a hinge. The 9kr value would have normally been printed on lilac rose paper, but a very few were printed in the colour of the 6kr value. The stamp is accompanied by a 1938 certificate from Philatelistisches Laboratorium (Berlin, giving an opinion that it is genuine, with matching expert handstamp on back of stamp), a 2018 Sergio Sismondo certificate (giving an opinion that it is a forgery) and a 2019 Philatelic Foundation certificate (giving an opinion that it is a forgery). Neither of the two modern certificates explain as to why they deem it a forgery, and if it is, we feel it is an extremely well made one. Catalogue value for a genuine used stamp would be $1,300,000. A very desirable stamp, whether genuine or not, and would look great in any German States collection. (Image)

Est $ 100