Inside the green building, climb the ladder then turn the wheel on the right to drop this item from the pipe junction above.
"German tags, Erkennungsmarken, were not the same for all soldiers at the start of the war. The shape, materials used, and even the information changed, depending on the region from which the soldier came.
In September 1915, a standard model was introduced, a disc with soldiers' names, dates and places of birth and regimental details. The model was replaced in late 1916."