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My general rule is that Scott prices are inflated 100 percent for "very fine" stamps. So at auction you did ok if you get a very fine stamp at 50 percent catalog. Scott #1 and #2 follow this rule very well (most of time). XF classics sell around Scott prices. XF-superb sell significantly above Scott prices. This is a general rule for common classics. When you get to the super rare stamps, one of a kinds etc, this rule doesn't apply.
Scott prices are for sound stamps without fault. Any fault dramatically reduces it to 10-20 percent catalog depending on fault type.
While you may be able to buy very fine stamps at half Scott or less on
ebay of from a dealer who is reducing stock, the criteria quoted above is not accurate. Because the marketplace is in flux, some Scott catalog values may be too high for more common stamps, they are too low for harder to find stamps. The Scott Valuing guide seems reasonably accurate for most stamps, dropping the price by 40% for fine to very fine, 60% for fine and 75% for very good sound stamps.
Condition is the problem. More and more stamps are returning from collections as damaged. The percentage of altered stamps continues to increase as more fakes are added to the market and recycled from collections. An off center stamp in poor condition might not receive more than 5 percent of catalog while a well centered stamp with minor damage might not receive more than 10 to 15 percent of catalog. I believe that graded stamps downgraded because of condition tend to be overvalued compared to sound, less well centered stamps receiving the same grade.
I believe the trend will continue and the value of damaged or altered stamps will continue to decline relative to sound stamps and the price differential between very fine and lesser stamps will continue to increase. Another hazard to less sophisticated buyers are dealers who over grade stamp centering or fail to not defects. Good, sound and clean stamps strong fine to very fine or better will remain the best experience if purchased
at competitive prices. However, if the stamp marketplace continues to contract, only the very best of the scarcest stamps may continue to hold their value.