Odd lead UK find

[cerebus]

Found pretty close to Heathrow airport. A bit smaller than a US penny. A little concave on the back with a small rim. Was ID as a Celtic potin, but I sent pics to a an expert/collector that said it wasn't. Any ideas?

 

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[old digger]

I'm not an authority on Roman coins, but it kind of looks like a Roman coin.

 

[cerebus]

It definitely has an old look to it, but don't think it's a coin as it's lead.

 

[ARC]

Lead seal or weight for sure.

I would also say byzantine.

 

[CRUSADER]

Looks like a very crude Medieval Lead Token.

 

[john845]

maybe a bale seal?

 

[DCMatt]

I would guess two piece seal as well. Especially with the little nubs on the edge...