This construction technique is called rivet and swedge. Swedges came in a variety of shapes and sizes and several could be attached together with rivets to form the most fantastical pieces. This was a common way of making jewelry with cold connections (no solder) and it reached its nadir in the 50s and 60s. You'll see a lot of atomic starburst brooches and earrings made this way, as well as flowers, and in this case, a bouquet.
A brief history of convertible brooches with a focus on Pennino Brothers of New York. This Italian immigrant family became one of the most prestigious houses in America's costume jewelry pantheon.
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