The pictures are to small to accurate tell you you can find out for yourself of what you have by going here: http://www.lincolncentresource.com/smalldates/1970Ssmalldate.html
From the photos they all appear to be large date. A better picture would help but from what I can see the sevens look like they are below both the nine and the zero. This is always what I have used. The link Shoewrecky provide is super nice and gives other methods that I had never used but will in the future.
The one in the upper right may be a small date. Looks like it to me, but hard to tell on that pic. 99% sure you have one small and the rest large.
I go by how short the "vertical" portion of the '7' is and how that short vertical makes the 'S' appear to be far away from the bottom of the '7'. You pretty much MUST have a known large date right there with a small date to pick it out for sure.
I go by the weakness of IBERTY on the Small Date coins. Yours are all fairly strong which tells me they are all Large Dates. Read and weep: http://lincolncentresource.com/smalldates/1970Ssmalldate.html
Hello..The pennies are to my eye all large date. The '7' on the small date is the same height as the '1' and the '9'. The loop of the '9' points toward the '7' on the small date. For information on this and an excellent reference point I use http://lincolncentresource.com. Have a gud one..Tony67
