A movie car for sale:
http://cgi.ebay.de/VOLKSPOLIZEI-WARTBURG-TOURIST-DDR-OLDTIMER-VP-OSTALGIE_W0QQitemZ290246723380QQihZ019QQcategoryZ29750QQssPageNameZWDVWQQrdZ1QQ- cmdZViewItem


They wrote, that it was used for more than one production, but it's not said, for what ones (perhaps we can find out over the database).
And it's also not said clearly, if it's a real original police-car or just a later "pimped" one.

P.S. The license-plate is a fake.