This pin is as perfect as the day it left the factory. The shape reminds me of an open crown sun hat with a pearl hatpin. It is made by Lisner and is brushed gold tone or plate with a flowing row of 6 prong set pearls that look like cultured but are probably excellent faux pearls.
The pin is 1.75 inches in diameter and has a safety clasp on the back. Signed Lisner. From the 1950s or 60s.