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Castillo de San Marcos 2021 $7.95 Stamps — Priority Mail Rate (Not a Forever Stamp)
Celebration Blooms 2024 Forever Stamps — Abstract Floral Issue, First-Class Postage
Celebration Corsage 2017 Two-Ounce Stamps — Wedding Mail Rate (Not a Forever Stamp)
Charles M. Schulz 2022 Forever Stamps — PEANUTS Centennial, Panes of 20
Chief Standing Bear 2023 Forever Stamps — Historical Tribute, Pane of 20
Chien-Shiung Wu 2021 Forever Stamps — Nuclear Physicist Commemorative, Panes of 20
Christmas Carols 2017 Forever Stamps — Double-Sided Booklet of 20
Christmas Madonna and Child 2011 Forever Stamps — Raphael Tondo, Booklet of 20
Christmas Madonna and Child 2024 Forever Stamps — Holiday Booklet of 20
Christmas Magi 2014 Forever Stamps — Holiday Celebrations Series
Chrysanthemum 2020 Global Forever Stamps — International Rate, Pane of 10
Colorado Hairstreak 2021 $1.31 Stamps — Non-Machineable Surcharge (Not a Forever Stamp)