VAM Rarity Scale
VRS = VAM Rarity Scale, developed by Van Allen & Mallis in their "Comprehensive Catalog and Encyclopedia of Morgan and Peace Dollars" - a modification of the Sheldon Rarity Scale to account for the larger quantities of Silver Dollars
R-1Common (Tens of Millions)
R-2Not so Common (Several Million)
R-3Scarce (Hundreds of Thousands)
R-4Very Scarce (Tens of Thousands)
R-5Rare (Several Thousand)
R-6Very Rare (Several Hundred)
R-7Extremely Rare (Few Tens)
R-8Unique or Nearly Unique (Several)
A plus sign (e.g. R-6+) indicates a higher degree of rarity