An oval of scarlet 3 1/4 inches (8.26 cm) in height and 2 3/4 inches (6.99 cm) in width with long axis vertical bearing a portcullis in yellow.
The Isthmus was the gateway through which the wealth of Peru passed to Spain and the Canal is now the gateway through which passes the commerce of the Atlantic and the Pacific. The portcullis symbolizes the gate and the red and gold are the old Spanish colors.
The shoulder sleeve insignia was approved on 17 May 1922.