Hey Bayonet collector, I am unsure of the vintage of this tag, but it is not a personal ID dics, even though it is the correct size and type, I agree with the Belgian that it should be zinc, and it should have the soldier's name and home town, this is (in my opinion) an Identifacation disc for some sort of equipment rather than a person.
Best wishes
Gus
Best wishes
Gus