How can you tell If a set of pfaltzgraff dishes are reproduction?

I bought this set of pfaltzgraff dishes at Goodwill yesterday. I looked them up on ebay because I want to buy some more pieces and I need to replace a plate. I believe the pattern is "folk art". According to this one seller this pattern was popular in the seventies and discontinued. But they also said you had to be careful not to buy a reproduction set. So I need to know how to tell if they are reproduction. I just want to know so they will match as good as possible. Thanks!!

Answers:
This is Pfaltzgraff's official (Canadian) site:
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