V. 1 is a detailed analysis of a previously unknown proof copy of the first edition of Galileo's Sidereus nuncius, in which watercolor drawings appear in place of the etchings of the published edition, consigned in 2005 to the antiquarian bookselling firm of Martayan Lan. V. 2 is an account of the composition and production of the edition, based on analysis of extant copies as well as the New York proof copy. V. 3 was written in response to the discovery, (...) soon after the publication of v. 2, that the proof copy was in fact an elaborate forgery produced between 2003 and 2005 under the direction of Marino Massimo de Caro, as first reported in the article "A very rare book," by Nicholas Schmidle, in The New Yorker issue of 16 December 2013. V. 4, in German, is a heavily revised edition of Horst Bredekamp's Galilei der Künstler, which had included a chapter on the then unrecognized forgery. (shrink)