coin doctor: someone who attempts to improve the appearance of a coin by cleaning, repairing, plugging and/or any other deliberate alteration.
PCGS On Coin Doctoring
In late May this year PCGS filed a US Federal civil suit against a group of 6 individuals they call 'coin doctors'.
Coin doctors will use wax or apply other foreign substances to alter the coin's appearance. They hope this will provide the coin a chance at a higher grade (and moreover a higher value).
Coin Doctorer
An individual who deliberately attempts to enhance a coin's appearance by cleaning, repairing, or any other form of alteration.
Coin Show ...
GUEST COMMENTARY: Coin Doctors - CAN'T STOP NOW - CoinLink
GUEST COMMENTARY: Coin Doctors - CAN'T STOP NOW
CoinLink
The coin market IS that town. Why does your dealer not comment? They could be best friends with a doc.
Coin doctors would take a slightly prooflike specimen, give it a high mirror gloss in the fields by polishing it heavily, then apply some sort of acid etch to the raised devices.
Altered Surfaces - The Coin Doctor strikes again! That mischevious devil tries to cover a coin's defect to trick the graders into a higher grade. A coin with altered surfaces has generally had a foreign matter applied to it.
Professional conservation should not be confused with "Coin Doctoring", ...
altering a coin by physical, chemical or other means to enhance its appearance and grade, and thus its value, without disclosure of the alteration to the purchaser of the coin. Individuals who "doctor" a coin are sometimes called "coin doctors." ...
 See also: Dollar, Coin, Numismatic, Grade, Gold
  
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