At Pen Ultimate Rare Books, we locate, authenticate, negotiate, secure and describe books for private libraries and institutions. From the first printing of Galileo's Il Dialogo (1632) to signed Harry Potter, we have built libraries for private collectors and institutions. We share your passion for collecting, and we pursue the finest copies procurable. Whether you're seeking to locate and authenticate a rare book or looking to consign a cherished book or collection, we work with you as fellow custodians of history.