Hi Kevin! My sense is that the first three series are by far the easiest(although they each have some scarce cards), and the last three are the toughest. Series 4 is scarcer than series 5, although series 5 has some real toughies. Amongst the last three series there is not a lot of difference. Lew Lipset once told me that he thought that cards from series 7 are the toughest and, gun to my head, I probably agree. Series 8 is tough and has a lot of cards. Series 6 has some real rarities and is very popular.
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