Edited for content
After doing some more researching, I found I was searching for the Union Signal and Switch Co. R-2. I now have the information to start a 3D design, but am still missing dimensions for a lens hood. If anyone has access to the US&S Section Index of Signaling Apparatus, September 1942, Plate C-8842-15, or knows of dimensions for a lens hood, I would greatly appreciate the information.
Thanks in advance for helping me fill in the missing piece!