with the base in such bad shape, it would be a tough sell. you would be doing it a tremendous favor by buying a repro copper screw base fitting and finding a way to get it onto the globe.
if you were able to do that, i would think around $400 to a gulf collector or someone that has a nice patina pump. maybe even a little more depending on the extent of the damage, which cant be seen real well in your pictures
just my 2 cents