1787 ABOLITION & SLAVERY. Important Early Anti-Slavery William Wilberforce Penny Token.Very desirable c. late 18th century 32 mm metal token inscribed with the what became known as the Negro's Plea, i. e. "Am I Not a Man and a Brother." The text surrounding a kneeling enslaved person in prayer, bound by chains. The design was originally created for the Society for Effecting the Abolition of the Slave Trade and popularized by Josiah Wedgwood when he used it on his abolitionist Jasperware cameo medallions produced in the late 18th