Apartado de correos 1001 is a 1950 Spanish crime film directed by Julio Salvador.

Miguel and Marcial, two agents of the Criminal Brigade in charge of the investigation, are, in the room of the deceased, a copy of " La Vanguardia " , in which they are appointed an ad asking for a manager for a chemical company, by payment of a strong bond, and the indication for more information write to PO Box 1001.

This unique track leading to the arrest of the murderer Initially, the film was going to be directed by Antonio Román, with Julio Salvador as assistant director.

Finally, Román went on to direct another film from the same production company, The past threatens, and thus Salvador was the director of Post office box 1001.

According to the policeman Gil Llamas, the work of the scriptwriters "was limited to handling the known data, seasoning them with the inevitable love story and with a certain murder perpetrated in front of the Superior Police Headquarters.