A Derby teacup and saucer, enamelled and gilt in Chelsea style with three mazarine blue and gilt

A Derby teacup and saucer, enamelled and gilt in Chelsea style with three mazarine blue and gilt cartouches of birds framed by swags, a gilt "harp' motif to the well of the saucer, having gilt borders and wishbone handle, saucer 14cm diam, Robert Bloor & Co, painted crown, crossed batons, D and gilder's numbers 11 or 13 in red, c1820. Minimal wear to the gilding on the top surface of the rim of the saucer, but in overall excellent condition and rare, no damage or restoration.