This item is a promotional advertising card for The Fabulous Duncan Sisters. It isn't dated but appears to be late 1940s or 1950s.

It is similar in appearance and size to a monochromatic postcard, but it has a plain back.

There is writing on the front and back, including the names of the sisters -- "Vivian" and "Rosetta." The edges are slightly worn, and two of the corners are bumped. Otherwise, it's smooth and clean.