Here's something truly special!  This is an original work by Hannes Bok, a Bookplate likely seen in one of the several compilations of his work published by Gerry de la Ree, and purchased from him by the editor, David Hartwell, in the late 80s or early 90s.  The work is on paper mounted on foamcore, 13" x 10.5" and carries Bok's signature and the date 1948, mid-right in the image.   dating from 1948 13” x 10.5” paper mounted to foam core, signed and dated 1948 mid right in image.  Quite a remarkable piece to find in the Hartwell collection, and a remarkable opportunity for a collector, as well.  You can check his auction prices.....you won't find a better one of his pen-and-ink works at this price!