Need help with identification OLD button

[Diggitdaddy]

A friend recently dug up this old button in a street tear out in a small 1800s Nebraska town. I think it may be a US National Guard button from World War I. Anyone out there can shed some light on this button, let us know! Thanks!

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[Fourman110]

Looks like you’ve already ID’d it.

 

[fyrffytr1]

Can you make out a backmark?

 

[Diggitdaddy]

No backmarks on it, just a loop where the button was. Doing more research on it my kids helped determine its a collar button from WW1 infantry button