I have a 1970 S, a 1970 D, and a 1970 no mint mark penny. Can someone please tell me if the 1970 S is a small date and if the no mint mark is rare?
Unless the 1970 with no mintmark is a proof coin that the mintmark was left off of, its likely worth face value unless it's uncirculated. Check out this link for details about the 1970-S small date: http://www.lincolncentresource.com/smalldates/1970Ssmalldate.html It would also be a good idea to post pictures of the coins in question since it will help others help you the most.