Secret Mark of D’artagnan, The (1962 George Nader)

Original title: "Il Colpo Segreto di d'Artagnan". Rare Musketeers film, in which D'Artagnan (George Nader) and Porthos (Mario Petri) work to unravel a treason against the king of France.  Also starring Alessandra Panaro, Massimo Serato, Georges Marchal, Magali Noel, Raf Baldassarre, and others.  Directed by Siro Marcellini.  Dubbed in English.