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https://www.myclassicjewelry.com/blog/vintage-jewelry-hardware/
Sep 20, 2014 · Antique and Vintage Jewelry Brooch Clasps The safety catch (also known as the “spring ring” clasp) was introduced in 1921. Improvements and modifications made throughout the 20th century. It eventually evolved into the modern locking clasps in use today.
http://www.charmchatter.com/bracelet-clasps-a-history-and-style-lesson
May 11, 2009 · Traditional Spring Ring Clasp - The most common type of clasp, which has a little spring inside the round shape of the clasp which allows it to open and close. The spring ring clasp was invented in the early 20th century. Jewelry older than 1900 will not have a spring ring clasp. …
https://www.rubylane.com/blog/categories/jewelry/dating-vintage-jewelry-by-clasp-fastenings/
Dec 31, 2013 · Early locking C clasps opened downwards, and more modern ones open upwards. The locking C-Clasp was patented in 1901. It was widely used for jewelry designs in 1910 and remains popular today. Early locking clasps often had a small rounded mechanism, and later ones had a locking piece that was separate and slipped over the holding piece of the clasp.Reviews: 1
https://www.jewelryshoppingguide.com/types-of-jewelry-clasps/
One of the oldest and most common types of clasps, the hook clasp is very simple in design. The clasp contains an S-shaped piece of metal that’s open at one end which hooks onto a ring at the other end of the piece of jewelry. It allows you to adjust the length of the chain if there are multiple rings.
https://www.realorrepro.com/article/Dating-brooch-fasteners
Editor note: Push-pull or Trombone catches were not referred to as 'safety' clasps until the later part of the 19th century. The Push-pull or Trombone catch was patented in Britain in 1850 and was used prior to 1890 in British brooch designs, well before they became popular in the US. They remained popular with British designers until the 1940s.
https://hobbylark.com/collecting/antique-jewelry3
Oct 24, 2019 · Most answers to understanding jewelry can be found by looking on the backs or undersides. Brooches have evolved over one hundred years, and the backs provide much of the information we need to date the piece. Again, this drawing shows the different types of clasps used on brooches or pins with the approximate date as to when they first appeared.
https://www.thesprucecrafts.com/identifying-and-dating-old-brooch-styles-4045094
Oct 02, 2019 · The clasp or catch shown here is from a 1930s pot metal brooch. Earlier variations had a lever that closed the clasp, while this style has a rollover closure. This is one of the most common types of clasps used on costume jewelry from the late 1920s onward, and it is still in use today. Many times it is referenced as a "modern" safety clasp.
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