1870 10L blue and brown, inverted numeral is a rare unused example of the inverted numeral error of the Ten Lira 1870 Postage Due issue. There are a great number of the used examples, which are common and not very expensive. The unused stamps are more interesting and valuable. According to the Sassone Catalog only three examples survived; and all of them are without gum. An incomparably scarce unused specimen of the inverted numeral error of the Ten Lira 1870 Postage Due issue was sold for $15,000 at Spink auction on January 29, 2008. The lot featuring attractive, gorgeous rich colors is an astounding inverted center rarity of Italy that rarely appears on the market.