Looks real - I would hope there's some docs to back it. Nice, regardless.
eBay Motors: Mercedes-Benz : E-Class (item 300209512580 end time Apr-12-08 08:46:18 PDT)
According to
Mercedes Enthusiast magazine's interview with Hartmut Feyhl, "According to Hartmut, six Hammers were built for the US; four saloons, one estate, and a coupe, although the latter had a two-valve motor. 'The coupe was built after I left [in 1989], and there is a possibility that there could have been as many as eight cars built here in total', he says."