Robert Plant Signed Autographed Complete "rolling Stone" Magazine Robert Plant Signed Photo Matted Display Led Zeppelin COA JSA Robert Plant Led Zeppelin Original Autograph Signed 8x10 w COA Robert PLANT autograph. A classic Robert Plant signed phonograph 8x10 size in black marker complete with numbered certificate document and hologram from Boston memorabilia All of our Certificates of Authenticity ( COA ) state the location and date of where the autograph signature was obtained. We are the only dealer as far as we know that provides this information with every item! In the hobby of memorabilia, this is very important.