From my current research into silver I would guess it's the purity. 999 is the purest silver you can find, Sterling is stamped 925, or 92.5% silver. I would guess 963 means 96.3% silver.
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.
The IS on Wm Rogers Silverware stands for International Silver.
It's WM Rogers and Sons, not WA. Google WM Rogers and Sons.
International Silver, which bought the rights to the (eagle) Wm Rogers (star) stamp in 1989.
Well, honey, that marking indicates your piece was made by the Wm. Rogers Manufacturing Company. The "bird and star" mark, along with the numbers "963," suggests it's silver-plated. So, no, it's not solid silver, but it's still a cute little find!
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The number "887" on Wm Rogers silver indicates the composition of the silver alloy used in the item. Specifically, it signifies that the piece is made from a silver-plated material rather than solid silver, typically indicating a higher quality plating process. Wm Rogers often used these numerical markings to denote their products' specific characteristics and manufacturing details.
If it is sterling it will be imprinted on the piece. Otherwise it is silver plate. Most Rogers Brothers is silver plate.
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