Handwritten on a white wticker on the bottom of the frame.
Stamped in white on the frame.
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. There are tags on each of the modules which say E12-8-1 through 10. The cooaxial connectors are numbered J1-1 through J10-4. At one end there are two terminal strips. Thre are two sets of two red and white indicator lights at the bottom. "output when... L5C7" is handwritten in black on the side of the of the modules.