MARCUS & CO.: AN EDWARDIAN PLATINUM AND DIAMOND BROOCH The plaque brooch with floral and foliate motifs set with old European, old mine, and single-cut diamonds, suspending a central hinged drop, weight 12.8 dwt, signed Marcus for Marcus & Co., measures 2 7/16 x 2 in. For further information on this lot please visit Bonhams.com For further information about this lot please visit the lot listing