Piedra de toque (1963)
| Release Date: | 1963, November 27 |
| Directors: | Julio Buchs |
| Countries: | Spain |
| Production: | Asturias Films |
| Cast: | Roberto Camardiel, José María Caffarel, Pilar Gómez Ferrer, William Marshall, Arturo Fernández, Susana Campos, Ángela Bravo, Ángel Ter, Alfonso Godá |