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fyrffytr1, I think you are partially correct, but let me give you what Tice has in his book. "A button device showing the spread eagle with a shield inscribed I was adopted in 1821. Enlisted men used the design until 1854 when it was replaced by a general service button without the letter I. Infantry officers continued to use the old style buttons until 1902, when the Great Seal device was adopted for all ranks." This may explain why we found so many of the "I" buttons on civil war sites.