Need to identify Old lead-bronze large coin

Hi guys
Last weekend when i digging, i found plate when i clean that i saw one sided lead-bronze 39mm coin with symbol like a Bird and unsual Point in the center of. Its been in clay lump. Someone can identify what is it coin, medal?
Some pics



Edit: coin digged near trier germany

 

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Looks like a lead alloy slug that has had a coin pressed into it.