I'd only a simple idea, ... as exploration always starts. I saw the fish and I understood, that it should be a heraldic sign - similar to the Visconti snake, which also appears as a single card in two of the Visconti-Sforza decks. So I took a book full of heraldic signs and looked for the fish. Later it turned out, that it is meant as a dolphin, but to me it looked neutrally as a fish. I found various fishes

in the rather opulent book, but only a few, precisely 4, which had a crown. They are shown at the right. They refer all to the same region, and the most mentioned location is "Desana". The card with the crowned fish shows the Dolphin of Desana, of the "Grafschaft Desana", as my book told it (my book was "10000 Wappen und Embleme, von Staaten und Städten nach Bildmotiven geordnet", Ottfried Neubecker/Wilhelm Rentzmann, Battenberg Verlag, Munich (they did forget the impressum, so no date). Desana, according to this site a small location, 131 m., 1052 inhabitants, is 8 km southwest of Vercelli and Vercelli is around 70 km in the west of Milan, near Novara. It's not easy to find anything of it, a Castello is there with a parco and the Castello is a Ristorante and there you get Risotto. And occasionally a poet reads poetry In our important time (ca. 1450) a Tizzone family lived and reigned there and in 16th century a Count of Desana Delfino (!) Tozzine (or Tozzini) married a daughter out of the house of the Picos de Mirandola. Later once the Marchese of Desana was also the King of Italy, but that happened much later and Marchese of Desana was only one of many, many titles he had, and he descended from the house of Savoia, so probably really related to the Tozzini family. . But as far I understood it,