I was very ready to jump in and say that it sounds like a fairly well known token, or evasion halfpenny; then I found this: http://www.nmmprints.com/image.php?id=398496 which is completely new to me. Others may be able to help you more.
I will pull this coin from my safe deposit box and post pics. as I said the obverse has admiral howe, and the reverse has Brittania seated left with sheild and spear.
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