This is a generic module rack four modules installed, three with two vacuum tubes each and one larger one with a duel tetrode. There are five empty spaces for additional modules. There are tags on each of the modules, numbering them E15-8-1 through 10. There are 16 coaxial connectors with cut wires. There are also numbers on each of the cooaxial connectors, labeled J1-1 through J10-4. At one end there are two terminal strips on the top and three at the bottom. There are two indicator lights at the bottom. One is red the other is white.
Stamped into a black label on one side of the chassis and hand written on a sticker on another side.
Stamped in white on the frame. The number is partially obscurred by a module.