I used to paint with lacquers and enamels back when, like 40 to 50 years ago or more. Lacquer can be brought back to life to a degree. It might be possible to restore the rest of the finish by buffing the surface with a good buffer and compound. Any minute cracks may blend and sort of "melt" together.
If the rest of the surface is like your pictures, then not much hope except to wax or do as suggested earlier to seal to create a moisture barrier. If the cracks are deep enough to go to bare metal then corrosion has probably started in there. What kind of primer system was used? Lacquer primers are somewhat porous and will allow moisture to permeate thru over time. If a higher quality primer, like a two stage was used you might be okay.
The areas you show will need to be sanded down and primed and then blend in the paint which is a bit of a lost art but can be done as long as the surrounding finish is okay.
My 2 cents and good luck!
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