Magnificent 18th-century hand-colored copper-plate engraving of seashells by Niccolo Gualtieri (1688-1744) from Index Testarum Conchyliorum (Index of mollusk shells), printed in Florence in 1742. Gualitieri is considered a pioneer of conchology and this work is considered a masterpiece of 18th-century illustrated malacological literature. The engraving is archivally mounted in matte with custom hand-painted French matte decoration, including hand-cut Japanese gold paper. Since opening her gallery in Washington, D.C., almost 20 years ago, Susan Calloway has developed a following that ranges from young couples buying their first “real” work of art to celebrated interior designers like Tom Pheasant and Frank Babb Randolph. Her clients, be they first-timers or seasoned collectors, benefit from her sense of style, refined taste, and unswerving commitment to quality. Susan's L.A. based daughter, Anna Calloway, has recently joined the business, and represents the gallery on the West Coast.