Now showing: United States - Postage stamps (1847 - 2024) - 1 stamps.
4. September WM: None Perforation: 11 x 10½
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![[The 75th Anniversary of American Chemical Society, type RO]](https://swmedia-4cd6.kxcdn.com/media/catalogue/United-States/Postage-stamps/RO-s.jpg)
