RB (Red Brown)
Term applied to a copper coin retaining 5% to 95% of the original red color of copper.
RD (Red) ...
1922-D LINCOLN CENT, MS-64 RED BROWN (ANACS). Obverse is almost completely red and reverse mostly red with slight hint of brown toning. No visible distracting marks or spots.
RB - abbreviation for Red Brown designation
RD - abbreviation for Red designation
Red Book - the popular name for A Guide Book of United States Coins, by R. S. Yeoman ...
One of the coins above has been designated as RB (red brown) and the other as RD (red). Which is which?
Is the coin on the left a RD or RB coin? What about the one on the right, RB or BN (brown)? What does RB really mean anyway?
This coin may be brilliant or lightly toned with very few contact marks on the surface or rim. Copper coins will have full luster with original or slightly darkened color and should be designated as "red" or "red brown".
buried or salt water, sometimes indicates with degree of porosity RB Red Brown, percent of Red may be noted RD Red RECUT Worn die or dies with shallow impressions were often reworked or recut to increase their life span.
 See also: Grade, Obverse, Collector, Condition, Proof
  
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