🔎 UNIDENTIFIED Piece of old farm equipment, machine, or something else?

[Marielle.KK]

This was found buried in a field in Washington County Pennsylvania about 3 inches or so down. Very rusted. Looks like iron maybe. What do you guys think it is? Thank you in advance!

 

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[potsherd_creek]

notched disc blade, broken when encountered a rock. From a farm disc, to some a harrow.