Dark ferrous metal, slightly convex marquise shape with vertical rectangular projection about 1/4 from one point. Projection consists of two thin metal pieces, 1.6cm tall and 1.2cm wide, soldered to the outwardly curved surface of the marquise. Lender's catalog number written next to projection. 1 of 3, original 1901, 48.44.3-#34 Franklin Institute catalogue number