Charleston slave badge from 1818 for Mechanic No. 94

This is a square metal slave badge with clipped corners. On the recto is text that reads ”CHARLESTON [stamped]” across the top. Under that is “MECHANIC [stamped] / 1818 [stamped] / No. [stamped] 94 [punched].” On the verso is a stamped cartouche at the top center with the maker's name “LAFAR.” There is a hole punched at the center top.