Is this a button?

[mlsoleil]

It is concave without any markings on it, found in Tennessee near an old barn

 

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[TheCannonballGuy]

First, welcome to TreasureNet and the What-Is-It forum.

Second, please go to the very top of the What-Is-it forum and read the "sticky" post there -- or click on this link to it: http://www.treasurenet.com/forums/what/136849-please-read-before-posting-items-what.html

Third, I think I know what your mystery-object is, but the only thing in your post which gives us even a rough indication of the object's size is your question "Is it a button?" When you measure its size with a ruler and give us that information, I'll know if it is what I think it is, and tell you.

 

[mlsoleil]

Thanks, still learning to use this site. Dont know what it is made out of, on my garrett 250 it reads between the gold and silver scale and measures 1 inch in diameter. Attached is another picture

 

[woodstock]

Looks like a decoration from some sort of horse tack to me ... HH , Woodstock

 

[TheCannonballGuy]

Thank you for the size measurement. I believe your brass disc with a small square hole at center is the correct diameter to be a US Army collar-insignia disc, missing the emblem. To learn more about that specific version of collar-disc insignia, go to the following website and scroll down to "Type 3 discs." You say yours is concave (not flat), so it is a post-WW2 version. See the section on "domed" discs, near the end of the webpage: Dating Metallic Insignia: Collar Disks

 

[mlsoleil]

Thanks canonballguy, i believe you are correct, thanks for the website it will help in the future