Rider-Waite "Mystery Deck?"

Diderot

I'm looking for some information regarding a deck I saw, but alas failed to acquire on eBay. It featured what I now recognize as the Rider-Waite artwork in a Duochromatic format. (Black lines with orange and green fills.) The cards also had very brief interpretations printed on either end, giving both the standard and reverse meanings. This is the only example of this deck I've seen, so any information that might help me in my search for its provenance would be appreciated. Thanks, Diderot