This medicine spoon is made of glass, so it did not tarnish, nor did it chemically react to, or absorb the material it held. There are lines along its sides for the measurement of liquids. The “TW” makers’ mark in its center probably means that the spoon was made between 1882 and 1885, by the medical and pharmaceutical glass factory of the Thomas Wightman Company at Armstrong, Pennsylvania. The company moved to Pittsburgh, Pennsylvania,  changed its name, and its trademark, to the Wightman Glass Company in 1885. This spoon was owned by the Hackley family, residents of Deerfield, Massachusetts, who operated a drugstore in nearby Greenfield in the 19th century.