Thanks so much for taking the time to answer. Gee, that sure looked like a "C" to me, however, now that you've pointed me in a direction I can see that it is, in fact, a "G". But it looks like the "Mavaleix & Granger" (1920-1938) mark to me, and that would make sense considering the prominent "M" in the mark, the only difference is the diamond shape created by the center of the "M", but it does look like a reasonable variation. Do you have a book that actually shows this mark exactly?
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