This petite bar pin measures 3 5/8 inch long, and is a little under 1/8 inch wide. It is set with 10 smaller rhinestones and one slightly larger center rhinestone. The 6 sided setting for the center stone measures about 5/16 inch.
The rhinestones are lively, but two do have some crown damage. The piece is marked 'Sterling'. Small but secure catch mechanism. Most likely 1920s or 1930s.