One more observation
Of the Majors that are not based on existing cards from the Charles VI deck, there is one, the Magician, that is patterned after a card from the Ercole d'Este deck of the same time period. Interestingly, there is also an existing Star from the d'Este, but the Star in the Estensi Tarot is not based on it, probably since it is too similar to the Charles VI Moon card (also featuring two astronomers). The existing Charles VI and d'Este cards are printed in color in The Art of Tarot by Christina Olsen and in black and white in The Encyclopedia of Tarot, Vol. 1 pp 112-117.
Berti mentions the d'Este deck in the LWB as a source, and also the Leber Tarot (in the Municipal Library in Rouen), which I have never heard of. Does anyone know where one can see images of it, or which Majors in the Estensi Tarot might be based on it?
ETA: One more note, the Chariot in the Estensi deck appears to be printed in reverse, based on the Charles VI photos in the two sources I cited above.
Felicity