The United States Postal Service will continue its American Landmarks stamp series in 2021 with a new stamp to be issued in January that shows a historic Florida fort. The $7.95 Castillo de San Marcos stamp will fulfill the new rate for Priority Mail flat envelopes, which is expected to go into effect Jan. 24. It is the 25th stamp in the American Landmarks series, all of which feature illustrations by Dan Cosgrove.
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