Determination help - Unknown coin

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Friendly ask for help to determinate this coin .

We can not find the exact item , maybe we have more succes in Germany !

This coin was found in Vlaanderen ( Belgium) .

Greeting , und Frohes neues Jahr !! from Holland , Pinpoint

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I see that until now their is no affermative reaction on this coin .
Maybe its beter to place this coin for determination in category Celtic ( Kelten ).

It seems that this item is also for the German specialist a difficult item !

Greetings from Holland , Pinpoint