A William IV Scottish silver mounted agate vinaigrette

A William IV Scottish silver mounted agate vinaigrette, maker's mark of R.H, Edinburgh 1830, rounded rectangular form, the hinged cover with an agate panel, possibly later, and a scroll thumb-piece, the silver-gilt grille engraved with thistles and a basket of flowers, the base later inscribed ' To Agnes from Auntie S.B. 1863', length 4.6cm.