ROGELIO DE LA ROSA & ROSA DEL ROSARIO IN "ANG MAESTRA" (1941): A FILM BY GERARDO DE LEON

What gimmick did the producer of RDR Productions’ "Ang Maestra" (1941) resort to in order to promote the movie?

Matinee idol Rogelio de la Rosa, who was both the male lead star and producer of the movie, wrote a personal letter to schoolteachers all over the country exhorting them to promote the movie not only to their students but likewise to their students’ families and neighbors as well. On a nationwide scale, that would mean millions of potential filmgoers. No wonder "Ang Maestra" became one of the most successful films of the prewar period, not only in terms of box-office but likewise from a critical standpoint too. (Amadis Ma.Guerrero)
(Source: A Movie Album Quizbook by Jessie B. Garcia)