Brass whatever

[The Gemologist]

This was found about three (3) inches down on a soccer field.

It's made of brass with a smooth ring on one end, that extends to form a square wire end. the wire is 5.0mm square, (3/16 inch) and smooth the entire length is 3 inchs

Whatcha think

 

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[mojjax]

maybe a fire extinguisher pin ?

 

[Wetgreenie]

Or is it one of those thingys used to unlock a Bedroom/bathroom door when locked form the inside.