I don’t have an overall favorite, but this scarce U.S. Army Corps of Topographical Engineers(opens in new tab) button is among the top few.  The button is one-piece, 7/8 inch, gilt yellow metal with a raised SCOVILLS / WATERBURY backmark, dating it to the Scovills & Co. period, 1840–1850. During this period the firm included J.M.L. Scovill, W.H. Scovill, Scovill M. Buckingham, and Abram Ives as firm's . . .

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