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After Trifari won a court case in 1955 for copyright infringement, patenting these types of designs was widely discontinued and replaced by the less-expensive process of design copyrighting.

It is obvious that Trifari and Coro patent information can be used to date pieces of their manufacture.

A great example is jewelry manufactured by Hollycraft during the 1950s.The pieces that were copyrighted by the company were marked with “COPR” (an abbreviation of copyright, used in place of the better-known ©) and also the year as shown in the examples here.Since Hollycraft was not a huge manufacturer like Coro or Trifari, and had a more defined style, this information is not of great use in identifying general styles of the decade.In an amazing coincidence, the jewelry and the vintage advertisement were found by the author within a three-month period, with the assistance of another CJCI member, Robin Deutsch.The three key primary dating tools, patents and copyrights, books about specific companies, and period advertisements, can be used as an initial step when researching a particular piece of jewelry.

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