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They can include airmail designs, different color proofs (such as purple or red), and various paper types.
They are test concepts submitted by companies like the International Envelope Co. or Nesbitt. envelope1.jpg
Some historical essays included "advertising collars"—decorative or promotional borders around the stamp area. They can include airmail designs, different color proofs
Collectors use catalogs like the United Postal Stationery Society (UPSS) to identify and grade these rare pieces. They can include airmail designs
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