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As far as Scott (general) is concerned, I have seen instances where it lists a stamp as a number and then shades as sub-numbers or sub-letters.
While this is true, these minor catalog shade listings are far from comprehensive. It is not Scott's goal to make a comprehensive worldwide catalog. The Scott classic catalog will have far more color shades listed, but even those listings don't include many of the color varieties/shades. It is an editorial choice on their part to decide what to include and what not to include -- you'd have to write and ask them regarding any specific stamp. If Scott were to include every single documented color variety, the catalogs would probably be 25% thicker. Compare the Scott US Specialized listing (where many of the color varieties/shades aren't even assigned a minor catalog number) to the general listing for US in their WW catalog, and you will see how much Scott leaves out. The fact is, we who are interested in color shades are a distinct minority in the stamp collecting world. The specialized catalogs fill our needs in that respect, not the Scott nor SG simplified catalogs.