It is a hallmark of the company.
Sears Roebuck silver
it means it is true or pure
Robert C O'Brien wrote "The Silver Crown".
The crown is the maker's mark or hallmark identifying the company that made the product; the number 3220 is probably the pattern number. If this is silver tableware of some sort, you are probably describing a silver plated item, perhaps from FB Rogers.
silver
The crown is Europe's stamp for silver. It simply means that the piece was made in Europe. European jewelry may also have a lion stamp. Is it possible that this piece is actually silver and not gold? If so, the 36 means that the piece contains 36% silver.
A silver bowl with a half moon crown marking and the number 800 on the bottom means that the silver bowl was made in Germany. It is hard to say when the piece was made, but many pieces of this type were made in Germany just before WWII.
The silver content of the 1981 British Royal Wedding commemorative general circulation crown is zero. It is a cupro-nickel coin. No British general circulation coin has had any silver content since 1946. The 1981 silver Proof FDC Crown coin which was sold in a case, has a 92.5% silver content.
A silver pattern crown coin is a British coin that was produced between 1707 and 1965. This coin is made of silver and has a profile picture of Queen Victoria on it.
There are 4 Isle of Man 1976 Commemorative Crown coins. Two are silver, two are copper-nickel. The silver coins coins are 0.9250 silver, as close as you are likely to get to pure silver.
I have very old necklace stamped 356 also with a Crown stamped also.