For your consideration is this pretty guilloche pin. It has pretty blue enamel and sweet pink roses. Circa 1920s or possibly earlier. It has a c clasp and is done in sterling silver. It is marked sterling with a triangle in the front which I am sure is a makers mark.
It measures 2 and 3/8 inches by a hair under 1/4 inch at center.
It is fully functional but has a bed in the pin back which could be somewhat straightened. The enamel looks good with a little f irregularity as shown on the ends of the center enamel. The ends are the same color blue although it does not appear this way in the first picture due to my lighting .. look at the second picture.