HELP with threaded shank/post eagle button

[Norwichnut]

Dug this button this yr at a local park, looks like it was gold plated before mother earth ended up with it..the shank was actually a threaded post like a nut held it onto whatever clothing article it was attached to, but i broke it off trying to bend it back straight ..is it a police,fire dept or military button?

Its the only threaded post button ive dug
Thanks for the looks

 

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[fyrffytr1]

It is an Army "Great Seal" button. It may have come off of a hat band. I can't ever remember when that particular style rim came out but I think it was either the late 1920s or 1940s. The great seal buttons came out in 1902 but they were rimless. In 1910 a rim was added but it was rounded. the flatter style rim like yours came out later and is still in use.

 

[Norwichnut]

Great info !! Thanks !!
My guess is it was lost in the last couple decades , as the gilt is gone but it hadnt started to rust away