That is a really cool story. What ever happened to the car?
It's possible that it still exists, though not with the original motor. It was too underpowered for the autobahn, so I swapped-in a 230 engine and tranny not very long after I bought it. Drove it all over Germany, France, northern Italy and Switzerland; put 300,000 kilometers on it in ten years, sightseeing. Every time the wife and I both could get three days or more of leave, we'd jump in the Mercedes and head for some famous cathedral, castle, battlefield, museum, medieval town, prehistoric cave, or Roman ruin.
It only once gave me a problem. One day near Nancy, France (if you're ever in the vicinity, you simply *must* visit the Museum of the School of Nancy, a fabulous collection of unimaginably beautiful glass-and-wood art nouveau architecture and furniture) it blew the head gasket. The local Benz dealership replaced it for 2300 francs, at the time about $460. Later I learned that the price at any German dealership was about half that. Body panels, fenders and so forth, were incredibly inexpensive at the German dealerships back then. Like, $60 for a front fender. Those little red side-trim plastic pressure rivets that the dealer charges $3.50 apiece for nowadays? Back then you'd walk into a German MB parts department and ask for some and they'd simply give you a handful.
I remember driving it down the French Riviera in December, in a fierce mistral wind. Every other car and truck on the road, including semi's, was getting whipped across lanes. But not that car. It held the lane like a locomotive on rails.
When my "deros date" (meaning, I was a civilian employee of the Army, I was transferred back stateside) came, I went to the POV (Personally Owned Vehicle) office to arrange shipping (Army soldiers and civilian employees were allowed to ship one car back from Germany to the US at taxpayer expense), but was told by the manager there that I would not be permitted to ship it back, because it did not meet US air pollution standards. So I brought my '95 Golf back instead. There was not enough time to put the Benz up for sale, so I simply turned it in at the local base strip lot in Heidelberg.
I later learned that there was no such prohibition, that I could indeed have shipped the Benz home. I still wonder to this day whether word had gotten around of the rarity of that car, and someone pulled rank on the POV office manager to make up that rule on the spot, so they could get their hands on the car