This is a generic module rack with ten modules installed. Most modules have two tubes, but one of the modules has a subminiature tube and is missing its second tube. The cooaxial connectors are numbered J1-1 through J10-4. At one end there are two terminal strips.
Handwritten in black grease pencil on the bottom of the frame,
Stamped in white on the frame. The number is partially obscured by a module.