Copper tag with numbers any idea

[Smilodon]

Hello, This was found the same hunt we found the three civil war era buttons I posted yesterday. Not sure what it is, you can see numbers on one side, but the copper item is to encrusted to tell anything else. If you look closely you can see the remainder of a copper chain that was attached to this item. This is about the same size as a penny. Any ideas

 

[trdking]

It looks like a dog ID tag with a phone number. Maybe clean it up a bit so you can see more?

Cheers