"Rech P[f]enn" means Rechenpfennig (German) = Jeton.
http://de.wikipedia.org/wiki/Rechenpfennig
Here is a list of Nuremberg manufacturers:
http://www.numispedia.de/N%FCrnberg%2C_Rechenpfennigmacher_in
and this should be at least a very similar jeton to the one you
describe:
http://www.omnicoin.com/viewcoin/898933

Jan Selmer.

Jay and Beth Stottman wrote:
> Some of my colleagues at the Kentucky Archaeological Survey found a
> token which we have identified as a French jeton in an early nineteenth
> century context in downtown Lexington, Kentucky.  This is the only one
> that we know of that has been found in Kentucky and perhaps the region.
> We would like to know where else these artifacts have been found
> archaeologically and about their context.  Also, we are looking to
> explain why it was there and what its value might have been to someone
> on the frontier at that time.  If anyone has found or knows where jetons
> have been found previously, we would greatly appreciate some
> information.  Here is a description of the jeton that we found.

> The jeton is French but manufactured in Nuremberg. The token is brass
> with gold plating. The obverse contains a bust of Louis XVI surrounded
> by the Latin phrase Ludovicus decimus-sextus Dei gratiG Franci£ Navarr£
> Rex. The image on the reverse face portrays Diana with a bow (on left),
> hunting dog (center), and trees (on right). The phrase Rech Penn is also
> stamped on the upper part of the reverse. The rim of the token is
> decorated with a grano di riso (grains of rice), or hashed, pattern.
> Based on the identifiable decorative elements, we think this jeton was
> likely manufactured sometime between 1774 and 1791.

> Thanks,

> Jay

> M. Jay Stottman

> Staff Archaeologist

> Kentucky Archaeological Survey