Now, as far as models go I am not sure where the line is drawn on new PCB/Old PCB with labels, but I do know some of the older PCB's were used on some and labels applied, but not sure if that applies to all models or only certain ones?

Rev. 1.0/1.1 was also a part of the discussion in regards to this same subject, here is the .de discussion I mentioned (Can't find the one about labels/PCB though)
http://translate.google.com/translat...%26prmd%3Divns