The coat of arms was approved by the state's congress in 1942. It is gold with at the bottom the words "COAHUILA DE ZARAGOZA", which is the state's official name.
The inner shield is divided into three sections. The top left section has a tree and two wolves, which were taken from the coat of arms of Biscay, because the cities of Saltillo, Parras and La Laguna belonged to the province of New Biscay. In the top right section there is a lion rampant on a gold field, and the words "Plus Ultra" from the shield of Badajoz, an important city in Extremadura. This refers to Coahuila's original name of New Extremadura. The lower section shows a river, a grove and a raising sun. The grove is related to the word "coahuitl" which means tree in Nahuatl. The river is the Monclova river (Monclova was the first capital of the state). The sun symbolizes that Coahuila is the birthplace of the Mexican Revolution.
Design based on the flag of Extremadura, Spain. By MetamarioMX. 2014.
Civic version of the design based on the flag of Extremadura, Spain. By MetamarioMX. 2014.
Design based on the flag of Coahuila y Tejas and the flag of the Republic of the Rio Grande. By MetamarioMX. 2014.
Civic version of the design based on the flag of Coahuila y Tejas and the flag of the Republic of the Rio Grande. By MetamarioMX. 2014.
Blue and green for sky, land and rivers. Sun has sixteen points, symbolizing Coahuila being the sixteenth state. By kyrgyzzephyr. 2014.
Coahuila flag proposal by Sotajarocho. 2015.
Coahuila flag proposal by Superham1. 2016.
Red for the Mexican Revolution, black for its mining and paleontological wealth; and the -so representative of the state- Flower of the Governess (Larrea tridentata) at the centre, make up the Flag of Coahuila. By Ricardo Vazoli, 2016.