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I'll support Stu and state that in everything that I've read and seen, argent was used in the beginning of the 51 production year.
Back to Joe's original hijack(!), this is what the first '51 color page (dated 11/15/50) from the Saleman's Handbook says. Ilya might remember there was some question back in those earlier discussions about what this says. It sure looks like the original standard 5 Star option got a body color grille, while the 5 Star Extra got the Argent. Also the Argent was an extra cost item on the Cowl/Cowl Windshield model. Stu