This plugboard has white lettering and numbering on its grid face. At each end there are two metal nails holding the wooden grid in place. The reverse side is covered with male connectors.
International Business Machines Corporation (IBM)
||Faintly visible on handwritten sticker on bottom edge
overall: 10 1/2 in x 6 1/4 in x 1 1/4 in
Memory/connector / plugboard
SAP Collection, Computer History Museum