A commemorative rummer of anti-slavery interest, late 18th/early 19th century, engraved to one

A commemorative rummer of anti-slavery interest, late 18th/early 19th century, engraved to one side with a chained and kneeling figure titled 'Am I Not a Man and Brother', the reverse with a verse 'Health to the Sick, Honour to the Brave, Success to the Lover and Freedom to the Slave', on a short stem above a thick foot, 16.5cm.