Coin weight or not?

Is this a coin weight, or a gaming piece or.... ?
its driving me nuts!

Is it heavy for its size? Looks more like a lead seal to me.

I think it's bronze it's 23g.

Sorry, 13g
at first I thought it was a lead bag seal

I just happen to have a copy of P & B Withers book "British Coin-Weights A Corpus of the Coin-Weights made for use in England, Scotland and Ireland" in my possession (I borrowed it from a fellow numismatist). It lists over 2,000 coin weights, which were made and used in the British Isles for British and non-British coins. A quick review shows that none were as crude as your piece.

Cheers Steve, I have sent a photo and details to my Finds Liaison Officer, hopefully she will be able to shed some light on it.