I just ordered a Grado cartridge and it came. I opened it up and it is marked "RP" on the top of the cartridge. I would think this means it is really a "Reference Platinum".
In fact I did contact Grado. Store thinks its their problem. I assume it was a mistake in pakaging. Grado agrees this is a Platinum. So I am working it out between the vendor and Grado.
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