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In philately, an refers to a design for a postage stamp or postal stationery that was submitted to the authorities for consideration but was not officially adopted for use in that exact form.

They are test concepts submitted by companies like the International Envelope Co. or Nesbitt. envelope1.jpg

These items are highly collectible because they represent the creative and developmental stages of postal history. They often feature unique variations in color, layout, or advertising "collars" that never made it to the general public. Key Characteristics of Essay Envelopes In philately, an refers to a design for