http://en.wikipedia.org/wiki/BakeliteThe testing report indicated the material is a Bakelite-like material and likley from an instrument panel. I think the testers would be able to tell if it was more a bakelite material and not a ferrous material just by lifting it or using a magnet. It seems they were so sure it was not ferrous metal that they didn't even bother to do a test for metal.
Does anyone know what AE's instrument panels was made of?
The large dials look close together in the image of AE. The hole for the adjacent large dial does not look like it shows up on the artifact in the area marked up. One way to check is to use dividers to determine the diameter. Then determine the distance between the dials in the AE photo based on diameter and see where the next dial would be on the artifact using diameter units as a scale.
For example if the distance between dials is 1/4 of the diameter of the dial in the picture you can determine where the next hole should be on the artifact. This can only determine if they are spaced right and can not determine if they are actually the same size.