Calling card of Lucy A. Chaplin. Nothing on reverse and no clues to locale, except that it was one of a number of calling cards, some of which contained Maine addresses.
It's possible that Lucy was Lucy Ann Chaplin, born about October 1861, daughter of William F. Chaplin and Mary Rounds (Dow) Chaplin of Naples, Maine, and future wife of Samuel Smith Chaplin, whom Lucy married in 1877.
If you know of a Lucy A. Chaplin who lived during the hay day of calling cards, please leave a comment or contact me directly.
Just in case the card belonged to Lucy Ann (Chaplin) Chaplin, below is a map of Naples, Maine.