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!
The "IS" mark on Wm. Rogers silver indicates that the piece is made of "International Silver," which is a company that produced silver-plated items. Wm. Rogers was a brand under the umbrella of International Silver Company, known for their silver-plated flatware and hollowware. The "IS" mark signifies that the item is a product of this company, rather than solid silver.
Wm Rogers 840 refers to a line of silver-plated flatware produced by the Wm. Rogers company, known for its high-quality silverware. The "840" typically indicates the silver content, suggesting it is made with a high-quality silver plating process. Wm Rogers is a well-respected name in the flatware industry, and pieces marked with this designation are often sought after by collectors.
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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.