It's just another form of nickel-plating using chrome instead. There can be numerous forms of plating recipes and I suppose hard chrome is suppose to be rather robust and not as likely to be worn off, scratch, or flake like nickel plated weapons.
I think it first came about before/during the proliferation of stainless steel guns and gave those shooters an alternate to worn bluing, or nickel-plating. I don't know if they still do or not, but some guns had hard-chrome plated barrels. I suppose the hard-chrome plating must be some pretty tuff stuff.
As for as the value of the gun....you never know what anything is worth until you sell it. I would certainly choose a hard-chrome over a nickel plating if I wanted one plated.
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