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Identification guide for designs of United States stamped envelopes, wrappers, and letter sheets
"Postal Service"

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There is only 1 design of an indicum that has no face value (except for a nonprofit indicum), neither numerical nor alphabetic. It is:

Postal Service

design UO7

design #UO7 Scott Equivalents Scott # color envelope notes UO14 black white   UO15 black amber rare UO16 blue amber rare UO17 blue blue

In 1877, this special die was prepared by the Morgan Envelope Company of Springfield, Mass.,
for printing non–denominational official envelopes for use by the Post Office Department.

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