The national flag of the Second Spanish Republic would have the coat of arms in the middle of the central yellow band.

Following the 1868 Revolution that put an end to the unpopular reign of Isabella II the Provisional Government that was subsequently established decided to modify the Spanish symbols, doing away with the monarchic elements of the Bourbon Dynasty that had been up till then part of them.

After reviewing a few proposals, one of which included a green civic crown, the following coat of arms was adopted: quarterly of Castile, Leon, Aragon and Navarre enté en point of Granada.

[2] The mural crown topped coat of arms was one of the main official symbols of Spain until the 1874 coup d'état by General Arsenio Martínez-Campos initiated the Bourbon Restoration, putting an end to the period known as Democratic Sexennium (Sexenio Democrático).

[5] The coat of arms of the Second Spanish Republic was flanked by the two Pillars of Hercules bearing scrolls with the motto Plus Ultra (Latin for further beyond).