It's a large date. I found this very helpful: http://lincolncentresource.com/smalldates/1970Ssmalldate.html
Really stinks because I think I have found something and it always turns out to be nothing. It's very disappointing. Discourages me a little, not that I am going to give up collecting, I love it and the hunt thrills me so I guess you're right, I will keep trying.