Purple silver tone Earrings Clip-ease jewelcraft creation 1920-1941 tags clip-on

On Coro’s history, RESEARCHING COSTUME JEWELRY MARKS – CORO* it shows that it Coro used the following marks: Mark: Jewelcraft 1920; Mark: Clip-Ease 1941; and The Paper these were attached to lead me to believe that the 1940s since its the later date of the two. On one earring on the back there is a C hallmark with a circle around it The second earring has one that I am unable to read with a loupe or zoom on my phone. It looks like it says PAT PEND