Is this a rock or man made?

[Subterranean Lizardwoman]

I found this metal dectecting in my backyard. My backyard use to be a horse field owned by my grandparents long ago so I don't know if it's anything related to that. It feels like a coin, but I don't think the unusual shape is from corrosion. If you have any ideas of what this is I would deeply appreciate it!

Thanks!

 

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[QUICKSILVER (appletree)]

looks like a Utility seal to me ( lead for a gas meter, water meter or electric meter)

 

[diggummup]

Size, weight? Scratch test it on a piece of unglazed porcelain or the underside of your toilet tank lid. See what color streak it leaves. What kind of detector you using? What kind of signal did it give off?