Not such. But you might consider posting it over on LCF for additional feedback. http://www.lincolncentforum.com/ More guys will start posting here in the evening. Also, here's another resource: http://www.lincolncentresource.com/
They look normal Here is the first page of 1970S doubled dies on Coppercoins. scroll through he pages and you will see which doubled die listings they have. http://www.coppercoins.com/diesearch.php?date=1970&page=3