This is an original 18th century Gouyn period porcelain Chelsea fob seal. These seals were given as love tokens by the wealthy and known as "toys". This seal features Cupid, quiver slung over his shoulder, standing by an altar sacrificing a heart. The seal has a white concave base, which reads, Je Vous Coffree
( L'offre), "I offer it (my heart) to you".
Charles Gouyn, a French jeweler , with Nicholas Sprimont a silversmith founded the Chelsea Factory in 1743. This is an original seal from the era in which Gouyn was manager of the Chelsea Factory.
Similar "toys" can be seen in the book, "The Chelsea Porcelain Toys", by GE Bryant. A documented image from this book, of Cupid holding a spy-glass, is shown in the last photo.