Hi Imho, it looks like 1970s ddo-002 Though I could be mistaken. Have you cross reference with varietyvista? http://www.varietyvista.com/07 Roosevelt Dimes/DDOs 1970-S.htm
Not the best images of the dime, so take a look at #3 . http://www.varietyvista.com/07 Roosevelt Dimes/DDO Detail Files/1970SDDO003.htm
You can see clearly that the date and mint mark are doubled to. Liberty is more obvious but this zoom in, u can see it clearly.
IMO your 1970 S Roosevelt looks more like Mechanical Doubling. Doubling looks flat and shelf-like. I'm not an expert on error coins. Try @Fred Weinberg, @paddyman98, or one of the other experts on Coin Talk for their opinions.