Old Military Artifact?

[DetectingDawg]

So this is my first time using the app, and I think I posted this in the wrong forum my first go round. Sorry. I was detecting my parents property in Georgia today. They didn't build their home until the 70's, but the land has been occupied since the early 1800s. I dug up this round disc yesterday. I am excited about it (hoping its CIV), but don't know exactly what it is. It's a round disc about the size of a half dollar. Unfortunately, it looks like it got hit by a plow point at some point. It is reverse struck and very detailed. You can even see E Pluribus Unum in the banner. In the circle above the eagles head, it looks like a shank used to be there. Any ideas as to what exactly it is or time period would be appreciated. Thanks in advance!

 

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[fyrffytr1]

It resembles the Great Seal which was first used on buttons in 1901. But, I think you have a pin instead of a button. It strikes me as being post WWII but that is just my opinion.

 

[Spats]

You may have the front of this two piece Great Seal button. Probably an overcoat button.

 

[duggap]

https://www.google.com/search?q=gre...X&ved=0CB4QsARqFQoTCJvx48XVsMcCFQKNDQodkyUBCg

I think this site may hold the answer. Notice where the bar was broke off on yours. As to time period, it would be early 1900s.