Just into stock, I know its not a Mercedes Benz, however a very nice example.
http://www.tradeuniquecars.com.au/detail/cars/unique-cars/bmw/320i/318484
I purchased this 6.9 a couple of years ago. It had a broken transmission and was a bit rough around the edges. Received it back this week after having a new interior fitted. Thought I would post a few pictures.
This video demonstrates how to remove ignition barrel on late W116 and W123 series. If you ever have a sticking barrel very important to remove it before it jams completely.
https://www.youtube.com/watch?v=H2kAIA2-sZ8