Paul,
For what its worth I have seen certain mechanical part with ref deg's. Most
notably HS for heat sinks, critical if not installed. These were usually
noted on the schematic and appeared on the silk screen. I have also seen ref
degs on silk screens  when stand offs of different lengths were installed on
the same PCB. I think what I'm getting at is standards are fine but we do
what we have to get repeatability out of our process.
Dan

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