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And why some replacement notes are more in demand than others...
Take the devils head replacements for example.
It's a Popular Series with a Short Print Run (Devils Head notes: 1954-1956). Plus a Limited Number Printed (The $5 Devil's Head Replacement only had 9,600 notes printed between both signature combinations). With all that in mind, Collectors will pay top dollar for these notes, because of their scarcity.
Compare that to other replacement notes which were printed in the millions, for a not super popular series (Birds Series for example).