After a couple of years I finally noticed that the German military MB 250 GD 'Wolf' was already used since early 1990, but all have already the chassis code W461 (so years before the civil W461 came). Everything confirmed by VINs.
So pleased Change year from 1993 to 1990.
http://www.imcdb.org/vehicles.php?resultsStyle=asImages&yearFrom=&yearTo=&makeMatch=- 2&make=Mercedes-benz&modelMatch=1&model=250+GD&modelInclModel=on&modelInclChassis=on&mk=&origin=- &madein=&madefor=D&role=