Stamped on a paper sticker on the side of the object
Embossed on the top of the object
overall: 2 in x 5 1/2 in x 9 1/2 in
The object is a module with two vacuum tube sockets that are both populated. Four phenolic boards are attached to 2 male connectors on the bottom. The object has a paper tag attached that reads, "C4-13-7."