Handwritten on a white wticker on the bottom of the frame.
Stamped in white on the frame. The number is partially obscurred by a module
overall: 13 in x 26 in x 7 1/2 in
This is a generic module rack with ten modules installed, each with two vacuum tubes of varying type. There are tags on each of the modules. The coaxial cables are also numbered J1-1 through J10-4. At one end there are two terminal strips. "Plump 440 E13-B" is handwritten on a white tag on the bottom of the frame and also engraved on a black plastic label. At the bottom of the module rack there are two indicator lights, one red and one white. There are four power terminal strips at one end. Two are on the top and two are on the bottom.