Keithley 2750-321 Slot Cover, with and without embossed text.
The model was designed using Fusion360, and measurements from a Keithley 2750-321 Slot Cover. The font is Neubau Grotesk, used in the Keithley logo as indicated in Tektronix brand guidelines.
The picture shows the comparison between the original piece (top) and my model (bottom).
The author marked this model as their own original creation.