I dug a button of some sort.

[GL]

In the buggy house out back, filling in dog holes I saw this lil guy and decided to clean it up so I could post it.
Looks like a button from a pair of overalls or jeans maybe a backpack, the back is just a rusty post as one would find on a denim type button.
Could be anywhere from 1864-2008 since this property has been occupied and worked during that time frame.
Hope that helps.

 

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[Detectingfreak]

Looks to be really old. Never seen any like it. Very nice job!

 

[GL]

Before I forget I also found a pearly one.
Round and shimmery, sort of bowed and real slippery feeling like soapstone.
Uneven in that it's not flat.