Unknown Celtic(?) Coin

[Schindkauter]

Hello,
Found this Coin a few years ago on an acre in Southwestern Germany.Already posted it in a German Coin Board but it was not identified yet.
Material seems to be silver
Diameter 12mm
Weight 0,84 Gramm(I think it once was more,due to the missing edge)
At one Side there are three blows,probably from a knive,the other side has one blow
Thanks for your help

[Figleaf]

I would suggest that you post a larger pictures by lowering the pixel depth. I can recommend a PM to our member Cavaros, who is very knowledgable when it comes to Celtic coins.

Peter