This pin looks brand new but my research puts it somewhere between 1955 and 1970. It is copyrighted by Vendome and has an H-A before the copyright mark. Vendome is the Coro company's top costume jewelry line. Hector Aquilar owned the Mexico branch of Coro. I don't know if the H-A stands for him or not. I cannot find any other reference to H-A Vendome.
The pin is gold plated with slightly cream enameling at the ends of the 3 arcs. It is 2 inches tip to tip so not too big and not too small. This is a classic pin that will go with tons of pieces in your wardrobe.