Banker’s Lamp ID Help

I inherited this late vintage or antique banker’s lamp. I know nothing about it, not even sure if it originally came from a grandparent or a great-uncle (my best guesses).

What materials (brass?? marble/onyx/granite??), era/approximate date, country/area of origin (USA? Ohio?). Can anyone tell me anything about it?

I found a very close match with google lens: https://www.ebay.com/itm/157499768052?_ This looks almost identical except for the shape of the section between the joint and the base—even the design on the joint looks the same. But the seller does not seem to know much about it: He says “bronze and marble” and “antique” but gives no approximate date, area of origin, or manufacturer. (I even wonder if he means “antique=100 years+” or just “antique=old.”)