Tiffany 16" diameter Greek Key table lamps are not rare, but this example is. It's got the most wonderful blue-gray, heavily mottled glass in the background and beautiful gold glass in the Greek Key border. 

The lamp is in outstanding original condition, with a fabulous library base. It has a great patina and all the original electrical sockets.

It's the best Greek Key lamp I've ever had.

More photos to follow. I hope to capture the authentic colors. This photo is not accurate.