When the company goes to play to the theater in the small town, part of the act is the Sabre Dance, from 'Gayane' by Aram Khachaturyan. However, Gayane was completed in 1942, while the action in the film takes place at most in March 1940, one year after the end of the Spanish Civil War.
Miguel recognizes his mother during the projection of news (NO-DO). The first projection of NO-DO only took place the 4th of January of 1943 and the movie appears to be in 1940 or 1941.