For your consideration is this beautiful circa 1940s pin. While I can not find a Coro mark, you can see this identical pin elsewhere signed by Coro. This does have a very faint Pat No but it is too faint to make out. I di d not even see it until researching this pin and finding another with the mark in the same place. This pin was attributed to Adolph Katz. These pretty pins by Coro are somewhat like tremblers. The center does move when you touch it. I believe the pin is made from pot metal.
The pin measures 3 and 1/4 inches by 1 and 1/2 inch across the widest points.
It is in excellent condition. The enamel and rhinestones look great and the hardware is fully functional.