Oh my. A classic Mercedes aficionado blogging at Tamerlane posted this sighting of a 450SEL 6.9 wagon, supposedly the "only one commissioned by Mercedes" itself for "the head of MBUSA."
That raised roofline was causing me much pain, until I clicked on his link to the Crayford Estates. Crayford was a coachbuilder in the UK who offered convertible conversions of W123 coupes, armour plating for VIP's--and absolutely atrocious-looking wagon conversions of the full-size, W116 Mercedes.
They apparently did this by installing the tailgate of a Ford Granada [!] between an all-new roof and the original boot. Which gave the Crayford 116 Estates the ugly little rear shelf that you may know from such automotive misfits at the BMW E34 5-series Touring--and the 1980 Ford freaking Escort! FORD!
Yet Mercedes was satisfied enough with the mods to give the Crayfords warranty protection and allow the three-pointed star to remain. Less than two dozen were built, and according to Crayview, the fan magazine of the Crayford Convertible Club, only nine have been spotted in the wild. Ten if Sophia Loren still has her silver, poodle step-equipped wagon in Zurich. It's not clear to me that any of the surviving Crayford 116 Estates are 6.9s I would really like to think not.