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Military Working Dogs 2019 Forever Stamps — Labrador Retriever, Honor & Service
Missouri Statehood 2021 Forever Stamps — Bicentennial, Bollinger Mill Design
Mister Rogers 2026 Forever Stamps — Stamp Encore Winner, Pane of 20
Monument Valley 2022 $8.95 Stamps — Priority Mail Rate, Panes of 4 (Not a Forever Stamp)
Mountain Flora 2022 Forever Stamps — Four Block-Print Wildflowers, Booklet of 20
Muhammad Ali 2026 Forever Stamps — Commemorative Issue, First-Class Postage
Mystery Message 2021 Forever Stamps — Visual Puzzle Design, First-Class Postage
Nancy Reagan 2022 Forever Stamps — First Lady Tribute, Panes of 20
National Marine Sanctuaries 2022 Forever Stamps — 50th Anniversary, Panes of 16
National Museum of African American History and Culture 2017 Forever Stamps
Nativity 2016 Forever Stamps — Traditional Christmas Scene, First-Class Postage
Neon Celebrate! 2015 Forever Stamps — America's First Neon Stamp