X
XF: abbreviation for Extra Fine or
Extremely Fine.
Y
year set: a collection of all
denominations produced in a given year.
Z
Zerbe Proof: Those
1921 Morgan dollars specially struck for numismatist and Mint friend Farran Zerbe. These Proofs are
not of the same quality as the other Proof Morgan dollars. The devices on these specimens usually
are not frosted while the fields lack the depth of mirror normally associated with Proofs. In fact,
the fields are characterized by heavy die polish, the planchets likely not burnished before
striking. (Both Philadelphia and San Francisco examples are known.)
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