Workmen encountered the device dating from the First World War during excavations at the rear of the Ijzer Tower estate. Work was underway to bury a new high voltage power line.
Bombs and shells dating from the Great War still regularly come to light in the area.
Dirk Demeurie of the Ijzer Pilgrimage Committee: "This was a whopper and was buried only 50 cm under the surface. It is a German heavy artillery shell measuring 60 cm in length."