In the description of the fretboard inlays of the AR300 from 1979-1987 I have serious doubts about the abalone you say they used.
You say specifically that it would be a MEXICAN abalone.
Being a shell collector since 1969 I ask myself:
"Why would they use Haliotis fulgens, corrugata or refuscens from Mexico, if in Japan they have their own Haliotis gigantea?
http://www.sealifebase.org/summary/Haliotis-gigantea.html which can grow upto 30 centimetres (12 Inches) and there are several smaller cheap species available from the Philippines region?"
Most descriptions of these inlays just say 'MOP/abalone/MOP'. Mexico is never mentioned anywhere!
It would have made more sense to import CTS potmeters, which they didn't either.
I would just say 'MOP/abalone/MOP', then you know for certain that it's true.
The "Mexican abalone" reference was taken from the description of the Artist series in the 1980 catalog, which can be found here. I'm not certain if Mexican abalone is referenced in any other catalog.
It is generally my preference to make guitar and component descriptions as specific as possible based on available, reliable sources. If you feel it's more appropriate in this case to use a more general term and you have reason to believe that Mexican abalone was NOT used in other years on these models, then I'm not going to protest this minor detail should you wish to edit the article.