The marks section of this book is the primary reason for owning it (forget the prices! The book is now in its 4th edition, published by Krause Publications, but I don't know if there are any additional marks.
I have a silver pendant that was recently bought at a thrift store for It has a large (about 32X22mm) agate or jasper cab, bezel set on a solid silver sheet. Regarding silver and wooden jewelry by Kaija Aarikka of Finland, I have several questions.
The are many reasons for using it over sterling silver. Most of the imports currently being mis-labeled as hill tribe silver are done in Ag .980, The smiths I've met over there prefer it because it is softer and easier to stamp and forge than sterling.
It melts at a higher temp and so folks over there do not like it for casting however.
Some countries, like France, use symbols rather than numbers, and so 925 would never have been used in those countries. A link to her site can be found on the Educational and Informational Sites page under Reference on my web site (last listing on the page). it would not come into use until after the sterling standard was introduced by england in the later part of the 19th century. goverment standards have been set for centuries and vary as to marks and country.
At 98 or 99 percent it is considered about as pure as one can get.of Providence RI, which is the listing ABOVE the mark on page 57 of Rainwater.Rainwater can be confusing, but just remember that the marks always follow the names and info in that book. You can find this info on page 38 of Maryanne Dolan's Collecting Rhinestones & Colored Jewelry, 3rd edition, where the info is UNDER the mark.Its hotter melting temp is one of the reasons that enamellists often use it here in the states.Due to its lesser copper content it tends NOT to tarnish as much or a quickly.
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So most Jewellery made by fine houses in Scandinavia will in fact be marked 830s but will have a standard silver of 925.