I just got this for my niece. It's a Dithridge Glass condiment caddy, made probably in the 1890s.
My great great great grandfather (on my mother's side) was William Dithridge. He was a master glass maker in England, and was brought to America, to Pittsburgh, Pa., in 1812 to help start a glass manufacturing industry. He brought his family over 2 years later.
Dithridge Glass, and Fort Pitt Glass, went on to become a major glass making company in the country. They closed their doors around 1900.
Anyway, this neat item is typical of the stuff they made. Elegant, and very Victorian pieces like this, salt shakers, cut glass pitchers and dishes, and kerosene lamp chimneys.