The CORREO AÉREO overprints on set cover

Set cover with all values of the CORREO AÉREO serie sent from Larache (Morrocco)
to the famous stamp dealer M. Galvez in Madrid via the Larache-Sevilla connection.
From 1924 no additional airmail fee was claimed for cards and covers on this route;
postage fee for single inland letters was 25 Céntimos between 1922 and 1931. The
special hexagonal airmail cancel was introduced in Spain in 1920 and is still in use today.