I know people have picked up all kinds of very expensive and valuable items from the dumpster, so I should't be too surpised. A nice 66 like that should in theory be easy to sell, it's a very early production (just after 1900) because of the back clamp foot. The red eye decals are very sought after by some and on yours they are in good condition. Be careful with them when you clean. There is a lady who sells a converter for the back clamp presser bar, and it will take the basic side clamp feet too. The machine might shine up further, and if there's sign of flaking it's often best not use sewing machine oil, but something else when you clean and polish it up. Oil can seep under there and give a sort of brownish opaque staining.
I don't know how used you are to get and old sewing machine back into shape, but very often you have to detect all the oil points, take off all plates and cover, clean under the bobbin case and around the feed dogs. Oil daily and do a bit of test sewing, even when you think it runs fine, it takes time to flush out sticky grime from the inners of joints and hinges. The stitch length knob should be oiled too, a drop on the threading and turn it in and out a few times. When oiling and test stitching you might as well keep it on maximum stitch length.
Best of luck :- )