Saar. 1920 2 1/2pfg mint single with the inverted overprint variety and right stamp showing rare broken "e" or "Sarrc" variety, doubly signed by Dr.Dub, a top rarity of Saar, only 3 known (2 mint and one used, this the only pair), cert. Burger (2004); ex Katz. (Image)

1920 2 1/2pfg mint single with the inverted overprint variety and broken "e" or "Sarrc" variety, doubly signed by Dr.Dub, a top rarity of Saar, only 3 known (2 mint and one used), cert. Burger (2004) stating in fairly good condition; ex Katz. (Image)

1920 75pfg block of four with one example showing inverted overprint and the rare broken "e" (or "Sarrc") variety, doubly signed by Dr.Dub as Saar top rarity, only three possible, cert. Burger (2004); ex Katz, lot 135 sold for CHF2'500I; (Mi. €2'800 without the variety) (Image)