James, theres' an Autotrader type magazine in Germany for classic cars called "Oldtimer Markt" and he's bound to find something there. If your German's ok, check out
www.oldtimermarkt.de, click on "Kleinanzeigen" and then on "ansehen'. A PDF document will come up and then click on that. A few moments later you should have pages of ads coming up. Scroll down to the Mercedes pages and you'll probably find a 6.9 or two. Probably also a Gullwing or seven, a couple of 300S's and all sorts of other exotica. The Euro prices are eye watering!