Antique Coro Guilloche Rose Jewelry set

This is a beautiful set of Coro Jewelry, gently used and includes necklace, screw back earrings and pin. I have tried to date the jewelry but have found conflicting info but I have narrowed it down to the 1940's or 1960's. The one thing I was able to determine for sure is that the Coro signature on the earrings was patented in 1919.