Seeing as how Dali was a huge LSD fiend, it may just be something he saw in his head. Still, he was talented and amazing. To me it means that a life based solely on beauty is incomplete.
Here is a website where you can see examples of Dali signatures. It shows authenticated signatures as well as Dali signatures of questionable origin.
Let an art expert first check out that *provenance*, especially if it's a late Dali work, from 1982 to 1989. Many late Dali works are fakes, or works by Dali assistants who let Dali sign them at the end of his life.