I would not polish those knives. It took decades to gather that character! Plain mineral oil on the joints, and all surfaces, with a little rubbed into the bone; wipe with a soft cloth after an hour or two, and you are ready to enjoy the knife IMO.
Oil on old cell may not be a good idea, but I defer to someone who knows more about celluloid.
Only partly visible, but if the stamping has Rochester N.Y. under the line, then the first knife is likely 1911-1921.
Can't see all of the second knife's tang either. Provide better tang shots, and I can help you more.