Variation D: Unpainted ALUMINUM that is brighter than Variation B. Produced in 1954-55.
Variation E: GREEN painted sheet metal. Production dates on this variation are uncertain. It was certainly produced in 1955-56, however, photographs dated earlier show this color of tower so there may have been two different production runs.
The YELLOW version is the rarest of these, but the RED one is hard to find also. All of these towers had black ladders with two wire connectors on the base.
This is another accessory where the best option is to connect it to a variable voltage accessory circuit so that the illumination could be set to suit.
Dimensions: 11-1/2 inches high, Base: 5 inches square.