Object is a large metal panel bearing 16 vacuum tubes (all present) and BNC connectors all around 3 edges. The back side is dense with resistors and capacitors and has a engraved labels for many connectors. "404 COMPARISON REGISTER CHECK" screened on panel. A paper shipping label is tied to one corner. A number of small labels name the BNC connectors; these labels are curled and peeling. A 3x5 card taped to the panel reads "NR3128-BOX 1-#2 / 2-404 COMPARISON REGISTER CHECK / #1, 13"