Charleston slave badge from 1817 for Mechanic No. 51

This is a square metal slave badge set on point with clipped corners. On the recto is text that reads ”CHARLESTON [stamped]” across the top. Under that is “No. [stamped] 51 [punched] / PORTER [stamped] / 1817 [stamped].” 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.