Unknown german coin, maybe Brunswick or Lüneburg [επιλυμένο]

Hello fellow collectors,

i got my hands an this old coin, but cant identify it properly.
I saw that theme with the bearded guy with a tree in his hand many times around Brunswick and Lüneburg but i cant find this coin.

Diameter is roundabout 26 mm
Thickness is lower 1 mm
Weigth is about 2,5 gr
Material non magnetic, maybe some kind of silveralloy.

Any help is very much appreciated.

N#410335

Thats it … thanks a lot 💯