From left to the right: PARKER # 14 eyedropper, fine silver over black hard rubber ( 1890 - 1898 ) ; PARKER # 31 , eyedropper, sterling silver over red and black mottled hard rubber ( c. 1905 - 1918 ) ; PARKER # 14 , eyedropper, sterling silver over black hard rubber ( c. 1905 - 1915 ).