This is a finished "comprehensive" artwork produced for F&SF magazine, created some time in the 1970s, and not used.  Interestingly, Hinge never got work from that magazine so I'm thinking he produced it for their consideration and submitted it - but they never ended up hiring him.  A "Comp" is the page layout of a proposed design as initially presented by the designer to a client, showing the relative positions of text and illustrations before the final content of those elements has been decided upon - so in this case, the title of the magazine and positioning of that has been mounted to the artwork (paste-up).  Hinge wanted to show the art director a draft of the final layout, as a guide for further design changes and, ultimately, the final art.   It's a great piece, fully in his style, matted and framed.  This is the only photo I have, so I'm estimating the artwork dimensions based on previous experience with Hinge's work, as approx 20" x 16" and add to that for the matte and frame.  If exact size is a requirement for purchase, wait a few days and I'll add it to this description!  Or not!   This will be shipped without glass.