Here's a pic from Stuart Kaplan's
Encyclopedia, Vol. 1. It's from the
Jean Galler Tarot. It says the same thing as the Vandenborre but a little easier to read. The Galler uses "V"s rather than "U"s. Kaplan's caption says what Philippe and kwaw already talked about.
"The two of cups contains a tablet inscribed 'Povr conoistre qve la plvs basse de deniez et de covpes enporte les plvs havtes qvand a fait dv Jev (
sic),'
which indicates that the lowest value cards in the suits of coins and cups carry the highest values when played in the game of tarot."
Where Kaplan says "qvand a fait" I believe it should be "qvand av fait." The (
sic) reference is Kaplan's.
It is a common feature of the two of cups of the Belgium Tarot pattern (though this particulary rule of the game, as noted above, is much older) :
Nicolas Bodet, Brussels (1743-1751);
Jean Galler, Brussels (1738-1760);
Sarton (1756-1767);
Jean Gisaine, Dinant (c.1750);
Martin Dupont, Brussels (1766);
Vandenborre, Brussels (1762-1803).
Although made by cardmakers in Belgium they are usually marked 'carte de suise'; possibly because they were made for export to this region due to the popularity of some new 18th century rules of the game there in which the Fool was treated as a trump, number 22, instead of the excuse.(?)
http://i-p-c-s.org/pattern/ps-19.html