An George IV sterling silver and hard stone (agate) vinaigrette, Birmingham by Joseph Willmore 1824. An George IV sterling silver and hard stone (agate) vinaigrette, Birmingham by Joseph Willmore 1824. Exceptional fine quality. Both the lid and base are inlaid with a beautiful hard stone panel and the interior grille is pierced and hunted with tendrils and floral decor. 3,6X2,8X1,8cm. 0,39gr.