Scott catalog values only tell part of the story when it comes to stamps, and this is even more true of revenues than front-of-book material.
There are a myriad of attributes that can positively or negatively affect the value of a revenue item compared to Scott value, in some cases by several orders of magnitude. These include, in no particular order:
The estimated retail value value I give is my personal opinion and is specific to the exact item shown. It is based upon similar items I have seen at auction, in person at stamp shows, in catalogs, in other collections, and experience buying and selling from national revenue specialist dealers. It is my estimate of a full retail price; when buying from other collectors, in bulk lots, or online at venues like eBay or Hipstamp, the price garnered could be considerably lower. My estimate should not be taken as gospel or as an indicator of value for any other item; it is provided for informational purposes only and should not be construed as a buy or sell offer.[an error occurred while processing this directive]