Mosaic Glass Table Lamp, later half 20th century, the shade with intricate trefoil design of blue lattice with a central green shell motif vegetation and scattered pink blossoms, all framed within scrolling panels of bright green, the adjustable standard on cast metal base decorated with four curving legs terminating in claw feet, supporting a four-socket ball cluster, the reticulated heat cap of foliate design with berry-form finial, cast iron base plate stamped "R. Williamson & Co., Washington & Jefferson STS. Chicago, Ill," ht. 25 3/4, shade dia. 18 in.