Looks to be MD - Mechanical Doubling or DDD - Die Deterioration Doubling Both have nothing to do with Hub Doubling which will cause a Doubled Die Only worth 1 Cent
First, welcome to the neighborhood @RickyD ! Your 70-S looks like machine doubling to me, not a true doubled die. Chris
Unless you paid more than a cent, you are OK. Some come with same they bought as a DD, and often paid a goodly sum. Welcome Jim
Went through a roll of these not too long ago and there were probably 10 in the roll that looked like this, all flat and shelf like. Seems to have been the norm for many of these. San Fran has come a long ways though, since those days.
Look closely at the date and mintmark. Do you see "doubling" on both? If so, and while there are certain exceptions, this is generally a good rule when trying to identify strike doubled coins. At that time (and up to 1989 for cents), mintmarks were punched into the dies by hand, and means they cannot display the type of doubling you're hoping to find.
