In Game of Tarot, Dummett mentions "an uncut sheet, showing twelve court cards which may come from a Tarot pack made in Toulouse, is in the Musée Paul Dupuy in that city."
He mentions it when discussing existing 17th century decks along with the Vieville, anonymous Parisienne, and the Adam C. de Hautot. He says it is discussed in "B. Dusan, 'Cartes a jouer anciennes', the Revue archéologique du Midi, Vol. II, 1869, p.120, which I have not seen"
I found the article online here:http://catalog.hathitrust.org/Record/010363288
Click the link, Volume I and II are in the same PDF, so look towards the second half, about two thirds into the document.
Here are three screen grabs going over two pages showing the 12 cards, (click to enlarge).
I can't read the article as it is in French, but perhaps someone who can will give us more insight into the deck. I'm surprised to see it dated from the 17th century, and wonder if Dummett would have agreed if he had seen it? It's very much a Tarot de Marseille II style deck, and it would be interesting to compare it to the Chosson or Madenié.