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LauraI have a fair amount of experience in the printing industry, and frankly, without a loupe and the chance to feel and even smell the card, (I know, that sounds weird, but there it is) I cannot say definitively whether the back is offset or some other form of printing.
One can presume professional graders use loupes and know how to discriminate between rubber stamp ink and offset or chromolitho ink.
When would the card have been printed? That would help determine the technology used.