Identification guide for designs of United States stamped envelopes, wrappers, and letter sheets
There is only 1 design of an indicum that has no face value (except for a nonprofit indicum), neither numerical nor alphabetic. It is:
design #UO7 Scott Equivalents
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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