Go through Coneca list and try to figure it out . Try to match the images on what DDO you think it is . There's 24 of them over there and make sure you only check the BS strike ones . http://varietyvista.com/01b LC Doubled Dies Vol 2/DDO 1970-S.htm
I'm inclined to say MD as well but better pictures would help. However, with what @Rick Stachowski posted it appears there are some very subtle ones with this date so maybe; but the photos aren't clear enough.
If what appears to be a DD is flat, then it could be a Mechanical Doubling. Better focused pics will help alot.
As has been said many times here, doubling on the legends, date, and mint mark...machine doubling. Sorry! This is what you're looking for: http://www.lincolncentresource.com/doubledies/1970Sddo1.html