1930s vintage industrial office desk gooseneck lamp, cast iron base w/ metal clamshell shade

1930s vintage gooseneck desk light in good, working condition. Finish is a little rough and rusty on this one - it's all original and has never been repainted or had the wiring replaced. Still has the metal clam shell shade.

This measures about 16" to 20" tall depending on how the goose neck is adjusted. I didn't see any label or mark, but older desk lamps in this style are usually Aladdin or Eagle lamps, American made.