one is an
LGP-30. 
 I dare to bet it's the last one.  Anywhere. 
 
There are at least another three in museums, at the University of
Stuttgart, technikum29 near Frankfurt (along with an LGP-21), and CHM in
California:
I've also seen discussion of a couple in private collections in the US
and Germany.
--
Adam Sampson <ats(a)offog.org>                         <http://offog.org/>