sterling I have a set of Wm Rogers & Son AA in front of me and it is definitely silverplate. So it is not necessarily sterling.
Yes
Oh, dude, Wm Rogers reinforced plate AA IS on flatware means it's silverplate made by the William Rogers Manufacturing Company. The "AA" stands for the quality of the silver plating, and "IS" likely refers to the International Silver Company, which acquired Rogers in the 1890s. So, like, it's just fancy talk for saying your flatware is silver plated and probably pretty old school.
98% probability that it's silver plated, here's how to check: Wm Rogers is an American brand, and all solid silver flatware made in America after 1870 will say ".925" or "Sterling" on it. If you don't see either of these it's silverplated.
The 4009 on a Wm Rogers silver platter means that it is #4409. Wm. Rogers numbered his work. Rogers was a master silversmith in the early to mid 1800s.
what is Wm Rogers 272 platter worth is $ 450
It's WM Rogers and Sons, not WA. Google WM Rogers and Sons.
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William A. Rogers was a silversmith.
William A. Rogers was a silversmith.