Awall
Greenie



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bizarre-- only thing I could think of is a piece of hardened clay that, when it was soft, someone pressed one of those cameo jewelry pieces into it to make an impression. Unless it's lead, which would make more sense if you found it with a metal detector. Someone making their own home-made gambling chip? There's no end to the weird unexplainable stuff that was made over the years.
Looks like something in 'sediment' Perhaps chip off a tiny bit at an edge. Or pour a very shallow amount of vinegar in say a bottle cap and stand the edge up in it with a clothes pin holding the piece vertical and see if you can dissolve away the surround material.
How long should I leave it in the vinegar? Can I use a toothbrush also?
Don't clean it until you are sure of its identity. Like Breezie said, you could ruin it. You might even loose the image on it.
It's entirely up to you what you do to your find, but 'if' it is a LEAD SEAL, with that amount of patina, it's probably more than 150 years old. If you submerge any part of it in vinegar, it can possibly remove the patina, thus ruin the piece.
If I'm understanding ConceptulizedNetherland correctly, he/she thinks it is sediment; ie. rock. If you indeed found it with your Garrett Ace 350 as you originally stated, it's some type of metal, not rock. Judging by your photos, it looks like LEAD, not rock.
Just my opinion (and don't let my blonde hair fool you!)
Breezie
I vote no vinegar on your item also. I believe it might remove the face. Nice find