t 18th-century copperplate engraving of coral by Niccolò 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. Hand-colored engraving of shells on the reverse. Since opening her Georgetown, Washington, D.C. gallery almost 20 years ago, art dealer and framing expert Susan Calloway has has been providing her clientele with an eclectic, meticulously curated selection of fine art from around the world, and sophisticated custom frames. Her clients, be they first-timers or seasoned collectors, benefit from her sense of style, refined taste, and unswerving commitment to quality. Susan’s LA-based daughter, Anna Calloway, has recently joined the business, bringing another great eye into the business.