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.
Wm Rogers Reinforced Plate AA IS on flatware is a code for the maker and the type of silver used. Wm Rogers is the maker. Reinforced plate means that it is not 100% silver, but a silver plated metal. The AA and IS are codes for where it was manufactured.
Yes
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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silverplate been checking on mine also
International Silver, which bought the rights to the (eagle) Wm Rogers (star) stamp in 1989.