A Victorian engraved silver 'castle-top' vinaigrette

A Victorian engraved silver 'castle-top' vinaigrette, by Nathaniel Mills, Birmingham 1843, rectangular form, the hinged cover engraved with Salisbury Cathedral, the interior with a silver-gilt pierced foliate scroll grille, the base with engraved foliate scroll decoration and monogrammed, length 3.7cm, approx. weight 0.6oz.