This coin from the ancient Kingdom of Aksum is located in the Walters Museum in Baltimore Maryland. The kingdom was located in what is now northern Ethiopia and Eritrea.
“The Aksumite Kingdom began to issue coins about AD 270. Silver and bronze coins were issued for local, everyday use, and generally followed the design of Roman coins with a bust portrait of the ruler in profile on one side. Aksumite coins were the first in the ancient world to carry the cross as a symbol of the ruler’s devotion to the Christian religion.” Walters Museum
Source: Walters Museum