I'm sure, your answer to the question is 'it depends', but I'm trying to understand what it depends on... As a bit of data, I did an informal survey asking dealers at the Baltimore show. Pulling all those responses together what I heard was 'I knock the price down by one to three grades from average industry retail pricing depending on the demand for the coin in a grade, type of damage, and how bad the damage is to the coin." Coming away from the show, it seems that the factors to consider are: 1. Demand for coin 2. Grade (UNC/AU/XF/VF/F/VG/G/AG/FA) 3. Type of damage 4. Severity of damage (includes the location of damage) 'Demand for grade' (1 and 2) really can only be considered once I understand the basic rules for how dealers price in the severity and type of damage. So what I'm asking is -- what are the basic rules for pricing the type of damage and its severity? NGC does a very good job of categorizing all the TYPES of damage in this pdf so I'll use this... How would you price a coin with each of these different types of damage if the damage was either Light, Moderate, or Excessive? Environmental Effects (Bronze disease, Corrosion, Environmental damage, Stained) Surface Alterations (Toning) Improper Cleaning (Artificial color, Brushed, Burnished, Improperly cleaned, Polished, Spot removals, Surface hairlines, Whizzed, Whiped) Mechanical Repairs (Chopmark repair, Mount removed, Plugged, Re-engraved, Removed from jewelry, Rim filing, Rim repair, Smoothing, Tooled) Mechanical Damage (Bent, Chopmarked, Countermarked, Damaged (catch-all), Graffiti, Impaired, Mounted, Mutilated, Scratches, Soldered, Wheel Marks) If you don't agree with the above, please express your opinions. Also, here is what others say: Rare Coin Gallery: "Establishing values for coins with NGC Details grading is probably the most difficult aspect. Current price guides do not give information about Details-graded coins. There is also the complication that there are dozens of reasons and varying degrees of Details grading. A coin that has been graded Uncirculated Details – Improperly Cleaned may be only slightly below the standards acceptable for NGC numeric grading. Another coin with the same grading designation may display much more surface cleaning. Buyers of NGC Details-graded coins need to determine value based on a coin’s eye appeal. In general, coins with Details grading sell for substantial discounts compared to those with NGC numeric grading. Anyone interested in purchasing a Details-graded coin should do research to determine value. Most auction company databases have images and prices realized of nearly every expensive issue. For example, there are literally dozens of 1793 Chain Cents on the Heritage Auctions’ website that sold in the last 10 to 20 years. Buyers can do comparison shopping to get an understanding on how to establish values for this scarce issue. The 1793 Chain Cent above was graded by NGC as Fine Details – Environmental Damage. The coin sold for $5,405 at the 2015 FUN show. A coin that has been graded by NGC as Fine 12 or Fine 15 would sell for $25,000 plus. This is about a 75% discount to the average selling price for numeric graded examples. The value for some collectors is clear." Coin Week: "In general, the value of a Details-graded coin is usually set at least one grade lower but sometime two or more grades. For the best advice on the value of these types of coins, you should consult a professional numismatist. Another suggestion is to compare actual auction records to photographs of similarly described impaired coins that have sold in recent years. When comparing auction records, it is critical to examine the coins carefully. Coins with minor problems might bring only a minimal discount. Coins with severe problems usually sell for severe discounts. Remember, these two coins could be described exactly the same on the label. When purchasing expensive Details-graded coins, you need to do your homework."