A copy of the original edition is a valuable rare book and as of December 2010 has sold at auction for US$662,500, including premium.[5] What would have been a multi-million dollar copy brought to a rare book dealer in 2005 with the title page signed by Galileo himself and watercolors, also attributed to Galileo, instead of etchings, was at first declared to be genuine by rare book experts and later shown by historian Nick Wilding to be a forgery and confirmed as such on further study by rare book experts.[2][6] It had been created by the Italian antiquarian and library thief Marino Massimo De Caro, former director of the Biblioteca Girolamini, Naples, Italy, and sold by him to an American rare book dealer.[7]