Old Light Fixture

When my Mothers house was sold after her death I took this hanging light fixture from a bedroom.My Mother was a sister to Lester Flatt (a bluegrass singer) and the house was his many years ago.He bought the house and added rooms and this was one of the fixtures that he put in .I'm not sure how old it is but it has to be very old.It is about 12 3/4 "across the top,11 1/4" on the bottom and 2 1/4" deep.I would like to know how old but I don't know anything else about it.I know it is very heavy-over 5 lbs.