At first I thought the torchbearer might be a reference to the Prometheus myth, but now I'm not so sure. I've been brushing up on eagle symbolism and one thing is clear, it is a solar/spiritual/intellectual symbol. It is also a symbol for victory. Often the symbolism of the eagle and the phoenix are interchangeable. The overall symbolism of this back design, coupled with the words "ALL' AQUILA," seems to represent the eagle in its spiritual and solar aspect. I could be wrong, but that is what it looks like to me. The original deck was published by Giacomo Zoni, so the only other thing I can think of is there might be some connection between this card maker and the symbolism of the eagle. But the only way to know for sure would be to find out if the design is original, about which I have no clue.