Nochmal INCUNABULA-L: „Those looking at the Moscow catalogue, or at least one version of it, will see that they can vote to have books digitized. Please consider voting for the „documentary copy“ of the Subiaco edition of Cicero, De oratore, 1465 — documented by its annotator Antonio Tridentone as having been printed before 30 Sept. 1465, and so the first extant Italian printed book (ignore protests from Princeton). This copy, another Klemm book, is usually said to have been destroyed or gone missing, but it has been in Moscow, slumbering, these last 70 years. https://search.rsl.ru/en/search#q=Subiaco%20oratore%201465 should find it at the top of the list.
Vote early, vote often!