Parkerizing, as near as I can tell, works only on ferrous metals? (Gun owner, here!)
But... maybe. I find that there is a certain charm in the black-worn-off case... and I have a period-correct (sorta) pigskin strap with a buckle (like the Fererro above) that has that same aged look.
The case is officially "silveroid", which is a nickel alloy. It was a hard decision whether to pursue it. If there was documentation, maybe....
Tom
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