The word "top" is ambiguous. It could mean "great" or "excellent" in colloquial Italian, suggesting this "little jewel" is of the highest quality. Alternatively, it might simply signify that this was a "top scene" or part of a top compilation.
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Mario Salieri is a prominent figure in the European adult film industry, known for a directorial style that often emphasizes high production values, dramatic narratives, and transgressive themes. The title you mentioned, Il Gioiellino di Mamma e Zia mario salieri il gioiellino di mamma e zia top