Two-piece construction, bronze gilt with green, white and red enamels, marker marked "CASTELLI-GEROSA S.A." and marked "MOD. DEPOSITATO" on the reverse, 14.5 mm x 18.5 mm, maker marked "CASTELLI-GEROSA S.A. MILANO VIA ALBANI N 20" on the button hole attachment, intact enamels, scattered gilt wear, near extremely fine.