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
"Wm Rogers reinforced plate AA IS" on flatware indicates that the flatware was manufactured by the William Rogers company, known for producing silver-plated flatware. The "reinforced plate" refers to a process where a thin layer of silver is bonded to a base metal, typically copper or nickel. The "AA IS" likely denotes the specific pattern or design of the flatware.
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.