I've not seen it on Lugers, but IIRC, I have seen a P-38 that had a gray-green finish (phosphate I believe, not exactly Parkerizing, but more like the Garand finishes)...
It may have been one of the French P-38's...Post-war...Manurhin???
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I like my coffee the
way I like my women...
...Cold and bitter... 
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