Clasps come in two halves, male and female. Usually marked on both halves .
This I R mark is on the female part of the clasp, the male is missing
Nice distictive mark, and even a dateletter. If London, the dateletter is either 1783/84 - which the style suggests, or 1823/24 which the presence of a date letter on so small an item indicates.
But I cannot trace the guy.
Is it an unrecorded mark of John Rich ?


