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.... puzzled when I didn't see listings in Scott for the 2c violet and color variants.
In reality, the Scott U.S. "Specialized" catalog is only a semi-specialized catalog or it would be immense. One must go to the individual authors or to specialty societies and their journals, catalogs, and monographs for more detailed listings.
This is especially true when it comes to postal stationery. The "Catalog of the 19th Century Stamped Envelopes and Wrappers of the United States" published by the United Postal Stationery Society (I have the 2001 edition in front of me), illustrates the various embossing dies and knives (which make the different envelope sizes), and shades. They list violet as the primary shade as well as a secondary red-violet for many of the die/knife combinations. Not to mention 130 years of environmental factors.