There are or were a couple of gunsmiths in Germany who turn out some very exotic Lugers. AFAIK, there is no intent to deceive anyone, but they do not have the same attitude of almost worship that U.S. collectors have toward the gun. It is just an old pistol that can be updated, customized, shortened, lengthened, engraved, etc., etc. Just like American gunsmiths did on the GI 1911's before they too became high price collectors items.
See:
http://www.touri.de/werle/Luger/luger.html
for some interesting items.
Jim