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

There is only 1 design of an indicum whose face value is "F". It is:

The Great Seal of
the United States
stamp image
design UO33
You have identified design #UO33 diagnostic for
Scott #UO83 (printed in blue and black on white paper),
(used exclusively to mail US Savings Bonds).


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