The Tuscany 4 Crazie with inverted value tablet is seldom traded and seldom exhibited, and it is largely unknown to collectors of World Classics. There is no question of its absolute uniqueness, its authenticity or its importance to Italian and to world-wide philately. The 1857 issue of Tuscany was typographed using common frame and vignette elements, with only the value tablets changing to create different denominations. For a small part of one printing of the 4 Crazie value, the value tablet for one position, was inverted. The unique feature of this stamp is that it is completely sound. No other stamp of Tuscany is known with a similar error. It was auctioned for $184,612 by David Feldman on May 22, 2010.