Never seen this before.
I went to check the info on the label at the outside compressing unit on a Miller AC and found it completely blank.
It was not that the information had faded to the point it couldn’t be read, it was just not there (Just to clarify- the label was present, but none of the manufacturer’s information had been printed on it).
I checked to see if it looked as if someone removed the original label and/or covered it up, but couldn’t find any supporting evidence to that end.
I tried checking the label on the top of the compressor and the one on the fan for some type of date or something but couldn’t find anything useful.