50 Pounds 15th Hijrah Century, Reverse Prueba

The 15th Hijri Century commemoration — marking 1400 AH, which fell in 1979–1980 CE — prompted a wave of issues across the Islamic world, and Sudan's contribution included proof and pattern strikes that never reached general circulation. "Prueba" denotes a trial or specimen piece, likely struck to test dies or secure approval before a production run that may itself have been limited or abandoned. Whether this example is silver or aluminium remains unresolved in the cataloging record, a distinction that matters considerably: aluminium pruebas were typically internal circulation tests, silver ones produced for presentation.