I would advise a Google search for pendant drum shade chandelier drum shade hanging drum shade and then look at "Images" as opposed to "Everything". Can try it with "Shopping" too. You'll see a number of fixtures that closely resemble the one you like. Didn't see the exact one, but there may be something there that you can work with. Good luck!!

Haverhill Pendent by Hudson Valley. Here is a link that might be useful: [Haverhill:[(https://www.houzz.com/products/haverhill-pendant-by-hudson-valley-lighting-prvw-vr~222756)

search square arm brass chandelier.

Thanks for the info! It's is very likely not old as the woman we are buying this home from rehabbed the home and changed out many light fixtures including this one. My guess is that the crystals are real as she did high-end finishes throughout the home. Any idea of the manufacturer and what it might be worth in re-sale? We want to install mid-century style throughout this 1957 ranch home but get something for the fixtures she had installed. Jim