Dating vintage brooch clasps
Mary Ann is an expert on Selro jewelry, and also Florenza jewelry and the history of Dan Kasoff Inc.
She has presented on vintage jewelry topics in several venues, including CJCI Annual Convention, Bead Society of Greater Chicago, Chicago Botanic Garden, and 2007 VFCJ Vintage Jewelry Cruise.
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.
When available, copyright information can be used in the same manner.
A great example is jewelry manufactured by Hollycraft during the 1950s.
Once primary sources are exhausted, many well-regarded books are great secondary tools for dating.
A selection of books can be found in “References and Links” section below.