link: https://www.ebay.com/itm/272935251503 This appears to be a Quick and Timely "Silence Plus" 22-slot backplane that has been cut down for use as a small test rig. Whoever cut it did a decent job, the edge is dressed with gaffer's tape, and the ground traces (which provide coax-like shielding) have been jumpered across at the cut edge. One slot has two bent pins. I can desolder and/or replace the socket if desired. The backplane is mounted on plastic runners, presumably to allow it to be laid on a tabletop or metallic surface without shorting anything out. Thanks, Jonathan