Hello (again), coredil
I own a "Grimaud-Arnoult 1748" deck as well, and I can give you some information about it.
You know, the colour schemes are quite different from Marteau TdM.
As to the drawings: apart from JUNON & JUPITER, it has several slight differences from 1930 Marteau deck .
1. LE BATELEUR has an acorn-like thing in his right hand.
2. The initials in the front shield of LE CHARIOT are "V.T". (Same as Conver)
3. The 9 buttons of the clothes of LE PENDU are differently disposed ("5 + 4", not "6 + 3").
4. LE DIABLE sticks out his tongue & has no male organ.
5. In LE SOLEIL, the droplets are going UP (as in Conver).
6. The angel at the upper left of LE MONDE is bearded.
7. Just like Conver, the 2 of Cups has a coat of arms (with fleurs-de-lis, but without the initials "G M") at the bottom.
HISTORICAL NOTES:
This deck was created after Baptiste-Paul Grimaud bought up the Paris cardmaker "Lequart & Mignot" in 1891.
According to the catalogue of the Cary collection, the silp case of this deck (which I don't have) has the title "TAROT ITALIEN".
It seems this deck had been produced until 1920's.
Almost undoubtedly, the deck which was mentioned in "LE TAROT" (3rd edition 1913) by J.G.Bourgeat and "LE TAROT EGYPTIEN" (1922) by Elie Alta as "tarot italien" is this deck.
And the Cary specimen must have been made 1909 - 1917 or 1922 - c1929.
(Judging from the 1890 tax stamp and the company name "Chartier, Marteau et Boudin", which was used from 1909.)
I'll post about Lequart's "Arnoult 1748" deck later.
kenji