A friend found this old lamp in a basement collection of junk. Can you help to identify it? Top embossing reads BOSTON & MAINE on the outer ring of the shade and on the very top it reads NEW YORK and DIETZ VESTA in an oval. There is also embossing on the glass [ sideways horseshoe with something within the perimeter of the horseshoe ] and MADE IN U.S.A. I tried to get a picture of the glass embossing but it came out poorly. Looking for any information on this relic of the rail roads.

Thank you Dan Gay