Need help identifying/date pocket knife

[wheres_wheatie]

Found this pocket knife today a few inches down. I couldn't see any detail till I gave it a rinse. The handles are made of some type of stone. Almost looks like slate. The bottom picture has pennies for size comparison.

 

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[BosnMate]

Seems like it's small, my guess in a gentleman's knife, possibly for cutting cigars etc.