Those are not high class knobs / locks. They are the cheap garden variety, made by a stamping type process. The only thing they are the better quality junk of the past. 50 years does make a difference in terms of junk quality. Those are more heavy duty, weight, etc. In the 50's they still made things pretty well, even if garden variety.
Real high class stuff, especially that which is sort of defined as antique is in a totally different class. Those are not particularly valuable. Probably do serve the function well. Might not be that easy to find a functional replacement for any type of reasonable money.
In the past I had access to lots of doors of all types, got them by the truck load. Used to always save all the locks, hardware, etc, cut up the doors for firewood. After awhile had this huge collection. Was super good money in it if you could rehab them. The valuable stuff is more antique and usually all brass or some other desirable metal. Yours don't fit into a category that would cause any real excitement.
But in your case, they probably fit the situation well. I would still try the cleaning, maybe a light polish if desired. Coat as necessary and call it square. You did not say, if they fully function and have no operational problems, if so, would just use a lot of care until I fully understood, how much rehab they might be capable of.
