Also this Dutch website mentions the lettering (but no pictures) ... http://www.muntenbodemvondsten.nl/index.php?topic=36776.0
with the lettering from earlier reply
Obverse: FRID WILH II BOR REX
and on the site it says 22mm diameter so is probably the same jeton.
Translations
Obverse: Fridericus Wilhelmus II Borussorum Rex [Frederick William II, King of Prussia]
Reverse: Ehre den König [Honour the King]
Looks like a Rechen Pfenning or jeton in brass made by Lauer in Nuremberg, Germany.
For those who don't understand Dutch, here is the story behind the link ZackUK provided:
This coin/token was scattered around for the inauguration of King Friedrich Wilhelm II, and that coin/token was legal tender only on that day, so that anyone who had picked up the coin/token could grab a beer on the King's account ...