Yes Alex,
This is (... commonly...) known.
It is the late 1963 230 SL owned by the late Paul Eppel and his wife Ilse.
This one-owner car has collected 1,200,00 kms which is equal to 745,800 miles. First engine (M127II), never opened, never overhauled.
The original miles are fully dealership-documented !! All inspections performed, very few spare parts exchanged throughout the car's life.
When Paul passed away a few years ago his wife (being in the late 80ies as well) sold the car off.
I think the car is still on sale, but I am not sure...
Yes, it is. Please see Joachim Stickel's homepage:
http://www.pagoden-center.de/select language, select showroom. It's the silver 230 SL 4-Gang (= 4 speed).
Enjoy!
Achim
(parts collector)