Antique Lamp

I know nothing about this other than it was my great-grandma's and my Dad (age 67) has always said it's an antique (he is not an expert in anyway). It is metal with 3 switches - one on the base, one to turn on the three lights, and one to turn on the main light. It's 56.25" tall. 2 prong cord. I'm just curious if this is worth anything or if it's a bunch of useless metal that would be better off being melted down. Thanks!