Identification guide for designs of United States stamped envelopes, wrappers, and letter sheets
"F"
There is only 1 design of an indicum whose face value is "F". It is:
The Great Seal of
the United States
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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