Given the age and nature of the sign (pressed or cast metal), the original type would have been hand lettered, not typeset.
The SARAO logo at that time wasn’t as compressed, and resembled Beton or Fakt Slab (you could distort either to get close to your sample). Not finding anything particularly close for CUSTOMBUILT, however.
I think you’d be better off finding a graphic designer who could use one of your images as a template for redrawing the nameplate in Adobe Illustrator.
Robert, the format of the nameplate necessitated a customization of the logo to lettering that was much wider and shorter (especially in order to accommodate the second line reading CUSTOMBUILT).
Before the age of computers, custom type like this was always hand-drawn.