This pin from Nuri is a combination of deep relief work and a cutout metal rim. The relief is a melange of stems, leaves and bits of plant life and the cutouts give the pin an abstract modern look. It is 2.75 inches end to end. And has a safety clasp on the back.
I'm not sure of the material or age of this piece. It may be silver tone metal but I'm leaning towards pewter or stainless steel. It doesn't look or feel like a plated or covered piece. I'm aging it as between 30 and 50 years old. Condition is excellent.