Here is an example with no 'rays' in silver though: http://www.pcgscoinfacts.com/Coin/Detail/6270?redir=t
The best I can do is this: It's got the Banner of the Holy Roman Empire on it, and XII Heller along with the date 1639. Now, this is in the middle...
That's an amazing coincidence, a mate of mine just found one yesterday with a metal detector in Devon! Certainly looks to be a coin of a Germanic...
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