I don't think they're exhibits
Not the same techniques or stock.
It all falls in the W card spectrum and the W card makers are a lot closer aligned than you'd think. It is evident that the W517s and Exhibit PC backs came from the same artwork--they have the same handwriting. I think there was a lot of cross-pollenating on the artwork in many of these sets. After all, why not re-use a regional issue in another region. Probably a lot like the Felix Mendelsohn cards with all the brands.
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