During the Korean war some plating metals were in very limited supply. To stretch what was available, mfgs went to different materials, eliminated what plating steps they could or thinned what was applied on non essential items such as decorative exterior chrome and some non handled interior pieces.
The eliminated steps and the thin layers resulted in very poor quality chrome. The pieces lost their shine, corroded or just generally did not hold up well much past the time the car left the showroom. In addition to the poor quality plating, in an effort to protect what was there, the piece was often painted with a clear lacquer or enamel which was worn off or deteriorated rapidly and added to the problem.
Packard published an article with details & care suggestions in SC Vol25 #14 -- here is an excerpt showing some pieces affected.
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