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runscottThe only premium I've ever seen associated with the series is some collectors think the 150 series portraits are more difficult.
But I have seen minor variances related to factory/series, the Matty Black Cap being an example that had minor amounts of color added/removed between Piedmont series, but that's pretty darn esoteric, and I couldn't find the same trends in the Sweet Cap versions. I have seen other cards that also went through minor changes in the colors used to print them - Vic Willis portrait for example - but I haven't owned enough of these to determine if the changes were made between series. Others would argue that color differences are due to "low ink", and in most cases this is certainly true, but if you closely study enough examples of the same card, you will find that in some cases ink was actually either omitted or the color changed.
Very esoteric stuff. The main reason I'm interested in it is that it provides clues as to how the cards were designed and printed.