Adjustable clamps can be used on a shelf 3 1/2" - 15" wide.
Offered on page 24, the of the 1920 Faries catalog as No. 72. Originally used on the top shelf of a roll top desk or shelf. All components are brass. Sockets are early General Electric turn keys w/ good mica interiors and clamp on shade holders. Shades are New Old Stock green and white cased glass shades manufactured by Kopp Glass of Swissvale, PA. I also have a pair of original Faries cone reflector shades that are included with the sale. Kopp glass shades retain original paper labels and one retains the original packing paper.