Ok, several comments suggested I polish Lola’s name plate. The plate was heavily tarnished and very difficult to polish. A thick layer of black residue covered the entire plate, which was virtually impervious to the polish. I had to resort to half a lime, salt, and lots of elbow grease just to clean the plate. Even then it does not polish up to a high shine and black residue remains on the corners. The plate appears to be brass, with etched lettering and logo, not stamped. The back is flat and featureless. Possibly, there was a layer of copper plating over the brass at one time.
Here’s the results so far:
For reference here’s the plate as it looked on the trailer door.