I've looked at some pictures and read a little bit this one's a little bit difficult to tell I guess of course I get the difficult ones anyways let me know what you think I drew my imaginary lines LOL
I'm gonna drop this here and let you figure out the rest: http://www.lincolncentresource.com/smalldates/1970Ssmalldate.html
Large date. The small date is rare and: The curl of the 9 needs to go around further. The point of the bottom of the 9 should be sharp not blunt and LIBERTY should be weakly struck.