The Variety Coin Register®
Copyright Ken Potter 1997, 2001
by Ken Potter - NLG
The following variety was submitted to the Variety Coin Register® and found suitable for listing. Its description and other pertinent information has been duplicated from the official listing card (with some possible minor editing) as found below:
1972 50c VCR#1/DDO#1 Doubled Die Obverse
Cross References: CONECA-1-0-II-C+V-CCW-K-11, Wexler-DDO-001.
Strongest doubling on TRUST; nice on IN GOD, entire front of neck with a split at the "V", portions of date; light on LIB of LIBERTY.
Reported by: Peter Bean 2/94; later stage (not shown) reported by Ron Pope 6/96 shows lesser doubling due to die wear; exhibits heavy flow lines.
Photocredit: Ken Potter, P.O. Box 760232, Lathrup Vlg., MI 48076-0232 USA 1(313)255-8907. © Ken Potter 1997.
Hub doubling, or what collectors commonly
refer to as a doubled die, is possible due to a phenomenon known as work hardening. This
causes the metal of the face of a die to become too hard and too brittle to allow a
complete image to be sunk into the die in one operation without causing it to crack or
shatter (during the multiple hubbing process). As a result, several impressions or
hubbings are required to produce a die when using this process. (The multiple hubbing
process was largly replaced by the U.S. Mint starting in 1997 and 1998 by the more modern
"single squeeze" restrained hubbing process.) Between each hubbing the die
is removed from the press and annealed (softened) thus allowing for another impression
without shattering the die. If for some reason a partially finished die is
reinstalled into a press for strengthening and the hub and die are improperly indexed,
resulting in a misalignment of images, or if the hub varies in design from the one(s) used
for earlier impressions -- hub doubling will result.
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