Button and pin ?

[Rusted Nail]

I did not find these but My brother dug them in south Texas a number of years ago, any idea how old.

 

[oldfireguy]

The U.S. collar disc dates back to C-1918 or WW1. I won't guess on the button but I'm betting around the same period.

 

[vayank54]

oldfireguy is right the disc is a WWI period collar disc. It had a threaded stud on the back. the button is a Marine button and about WWI as well.

 

[Rusted Nail]

Sweet, Thanks for the id.