Dating vintage brooch clasps
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.Researching Costume Jewelry at Way Jewels at Glory Antiques at Mary Ann Docktor-Smith is a vintage jewelry collector, historian and dealer.She also creates artisan jewelry using vintage and natural stone beads, polymer clay and cork.
It is obvious that Trifari and Coro patent information can be used to date pieces of their manufacture.
However, determining findings popularly used is possible.
For example, in looking at the use of clip-back and the use of screw-back findings for earrings, a survey of those currently for sale found that from 1950 through 1955, screw-backs were used about 30% of the time, and clip-backs 70 percent of the time.
A second primary-source dating tool is the use of books about fairly-large and prolific costume jewelry manufacturing companies, where original sources have been used by the author.
Two great examples are Florenza-marked jewelry presents a dating challenge, as there are no original records for the company’s production.