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Judge Dred (Fred)If your collection consisted of 2 sets (T, DR, F) from the 1980s and the rest 19th century cards then 25% of a collection being 19th century isn't so bad because that'd be a few hundred 19th century cards.
You could break this down to the following:
Percent of the number of cards in a collection
Percent of dollar value of the cards in a collection.