Stone slave auction block from Hagerstown, Maryland

A large gray carved marble Calc-silicate shist stone with a flattened top and bottom, squared back and sides, and a rounded front used as a slave auction block in Hagerstown, Maryland. A rectangular metal plaque is screwed to the top of the stone, with embossed text reading “GENERAL ANDREW JACKSON / AND HENRY CLAY / SPOKE FROM THIS SLAVE BLOCK / IN HAGERSTOWN / DURING THE YEAR 1830.”