Signed NUART. Not many of these around. This marigold example sold in 1997 for $20. In 2000, an iridized crystal example sold for $30. In 2005, a marigold example sold on eBay for $57.
In 2008, David Fetterman sent me photos of a two-shade lamp with Coral Shell shades. The brass shade holders were marked Dec. 24, 1912.