British manufactured for the Confederacy, Confederate Engineers.  Identification by Tice CSE 212-A1, Alberts CS 152. Convex, two-piece.  This button has always been popular with collectors and examples have commanded substantial prices, due to their size and unquestionable beauty. Cuff size version is rarer. Front has a lined Manuscript “E” on a plain field. 26mm. Backmark “S. ISAACS CAMPBELL, & CO. / LOMDON / ST. JAMES ST,”