Stamped in yellow ink on the chassis on the extraction end.
overall: 1 3/4 in x 8 1/2 in x 7 1/4 in
This module has six miniature vacuum tubes and a neon bulb mounted on a chassis located at the extraction end and a phenolic board holding 22 bannana plugs that serves as the insertion end. Components and 3 small phenolic circuit cards mounted perpendicular to the chassis are mounted in the 3.5 inch space between the chassis and insertion end. There appear to be three identical sections using two vacuum tubes each.