List of SW actors with at least 3 appearances in current Top 20 films (errors and omissions excepted):
Benito Stefanelli, Lorenzo Robledo 9
Aldo Sambrell, Frank Braña 7
Mario Brega, José Canalejas, Antonio Molino Rojo 6
Lee Van Cleef, Tomas Milian, Ricardo Palacios, Alvaro de Luna 5
Gian Maria Volonté, Franco Nero, Luigi Pistilli, José Torres, José Terron, Antonio Casas, Romano Puppo, Simon Arriaga, Spartaco Conversi 4
Clint Eastwood, Klaus Kinski, Edoardo Fajardo, Nello Pazzafini, Angel Alvarez, Roberto Camardiel, Al Mulock, Bruno Corazzari, Raf Baldassarre, Roman Ariznavarreta, Calisto Calisti, Guillermo Mendez, Remo De Angelis, Claudio Scarchilli, Ivan Scratuglia 3
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Well-known names like Gemma, Wolff, Berger and Sancho reach the 2 films mark. As for Fortunato Arena, who as far as I know holds the record with around 80 (!) SW appearances, he’s in The Great Silence and, funnily, in all four films between 21st and 24th place!