Here is a link to a very good website on Jefferson nickels. I directed the link to the information on step grading. With Pcgs you need to have 5 full steps that are not bridged and can not have any nicks that are deep enough to get to the "valley" between the steps. It took me about 3 submissions with Pcgs to get a good feel of their standard.
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Ooops, I forgot, you might go check out the photos in the Jefferson Registry sets too.
Variety Nickels