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International Silver Co. according to the website antiquesandthearts.com
IS stands for Inlaid silver. ie Holmes and Edwards have a full line of Inlaid silver, which is major improvement over silver palte and the IS is stamped on each piece, usualy in a square box stamp
The "IS" silver marking on flatware stands for "International Silver Company". The flatware is silver plated. Visit the link below for details about other silver markings too.
International Silver Company, founded in 1898 from a number of smaller silver manufacturers that specialized in silver plated tableware.
IS stands for the International Silver Co. and unless it says sterling or 925/1000 it is silver plate.
rogers cutlery & CO
International Silver, which bought the rights to the (eagle) Wm Rogers (star) stamp in 1989.
silverplate!
331 mean on silver
No. It's just steel no silver at all. If it is silver plated it will say so, but that does not mean it contains silver. A plus A nicely made set of stainless steel flatware may not be silver, but you don't have to take it out of it's presentation box once a month to polish it.
"Chippendale" is the name of the pattern. You can think of it as a collection; "the Chippendale collection." The manufacturer (in this case International Silver Co.) would make a whole line of flatware, hollowware and serving pieces with the same matching pattern.
The 925 stamp mean the jewelry made from 92.5 percent silver.