What classic series(pre 1940's) is the least messed with?

What classic series do you believe is the least messed with? As in least amount of problem coins(from cleaning, tooling, whizzing, coloring, and fakes).
Either write something worth reading or do something worth writing about. -Benjamin Franklin-
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Comments
no series is immuine
By the way, Robert/ RYK, I have seen some especially terrible/other-than-original Stella's
Worry is the interest you pay on a debt you may not owe.
"Paper money eventually returns to its intrinsic value---zero."----Voltaire
"Everything you say should be true, but not everything true should be said."----Voltaire