This is most likely not a 1970, as I believe the first year for this model in the US was 1971. After 1972 Opel stopped importing the sedan, so my guess is this is a MY 1971 with a 1970 build date. The seller does not have a title.
There really isn't much else I can write about this. It's free. Free Opel parts. (Or a serious restoration project.) Free is good. ;-)click here to see the Craigslist ad.