Very old iron or bronze stained glass lamp

Hello all, I inherited this lamp from my mom and grandmother, who was born in 1888. Grandma got the lamp (I think from Grandpa) around the time my mom was born in 1923, supposedly from the Ft. Tejon Ranch in California. It weighs a ton, looks to be solid copper, iron or bronze and is in perfect shape. The glass is original. The detail on the base is outstanding. It look to me like art nouveau. Its 24” and the lamp shade is 19” diameter. Please help me identify something about it! Thank you.