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Julie, your Caldwell reprint probably falls pretty squarely in the midst of the Art Nouveau period, given the binding decoration - at the turn of the century.  There are three similar copies offered on ABE:

http://www.abebooks.com/servlet/SearchResults?bi=0&bx=off&ds=30&kn=Caldwell&recentlyadded=all&sortby=17&sts=t&tn=Tale+of+Two+Cities&x=39&y=10

in the same general price range.  Other Caldwell "Berkley Editions" can be searched on ABE, and one - Barrie's The Little Minister - dates to 1898, so it's probably safe to assume that the whole series does likewsie.

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I'd probably use "decorated binding" and "Nouveau" in the title line, along with "Tale" "Cities" and "Dickens."

The 'ragged' edges are the result of the fact that the bolts (the folds where a bifolia later becomes two separate leaves) of books (one edge in a quarto or folio, two in an octavo) were once opened by their owners and not cut by the publisher.  The result is sometimes erroneously referred to "deckled," but deckling is actually an intentional process in and of itself, and unrelated to untrimmed edges.

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