Gold Button?

[be2019]

My brother and I went over into Missouri to a park and did a little detecting. We both found some clad coins and then I got a nice signal on the Minelab Safari, which I am trying out, anyway about 7 inches down I see this gold shiny round thing.. My first thought was, I found a gold coin, well it might of been my second thought and the first thought was Oh #$%^.
When I pulled it out I was amazed of the weight of it. I also could see there was a straight post on the back. after a closer look we could see the post is threaded. Can someone please tell us what this is. I will weigh this when I can. Size is about the same as a nickle. Thanks for looking, HH.

 

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[nsdq]

not sure but it has a screw as seen on many hat decorations like high school marching bands

 

[I-DIG-IT]

Nice digs.

 

[WheatWaffle]

Nice finds!

 

[GatorBoy]

Reminds me of a wax seal stamp.. Pretty sure its brass

 

[coinman123]

It looks old, cool find!