1921 Morgan from "so-called Zerbe dies" question

How common are these? I bought a mixed roll of BU dollars (half 1921 Morgans and half Peace dollars), of the 10 Morgans three have the 17 berry reverse:



"It's far easier to fight for principles, than to live up to them." Adlai Stevenson
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It would be nice if the "myth of Zerbe proofs" would also die.
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<< <i>Only about 12 million or so. >>
Where did that number come from?