The upper slide looks ready to go, that is to be fitted to a frame. It has sights, and at the time the sights may have cost more than the slide.
The lower slide looks like it is one of these, welded up big old Bomar cuts.
I welded this one up and put Novak's on it. It is an old bullseye Fanken gun, Colt slide , RR frame, old tall Bomar with a huge base cut. Gun that someone stuck a bunch of drop in, junk on.
But you can not fit a modern sight to that big Bomar dovetail cut and if you look at the weld over flow on the lower slide you see the size of the base cut. A GI base cut is small and can be just recut.