Handwritten on a paper tag attached to the handle.
Stamped in white at the top
overall: 2 in x 6 1/8 in x 10 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. Printed on the top of unit is "CONTROL PULSE OUTPUT". There are labels for all the jack and labels identifying tubes.