✅ SOLVED ID help please

[olas13]

Hello everyone. I am following a street tear out and have been able to detect some very small areas of the old road. Yesterday I dug this Button? / rosette?...
The front has a small dot pattern behind the US. The reverse has a single mark in the center missing whatever used to be on there.
IT has obvious damage like a lawn mower blade cut possibly.
I was hoping for some help ID ing it.
One very close design I did find was for a Brass medallion for a scabard. The only problem is it is not nearly as thick as the medallion.
Thanks in advance, Bob.

 

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[vpnavy]

What on the back?

 

[olas13]

smoothe with a single center mark. nothing attached.

 

[Charlie P. (NY)]

WWI era collar insignia?

 

[olas13]

that is very close. pattern is the only difference I can see.,. Thanks!

 

[nhbenz]

I think Charlie is right on, except according to the site below the example shown is from just after WWI, where yours matches the ones that are from WWI.
Dating Metallic Insignia: Collar Disks