Silver Poppy Pinwheel 1/2" Shank Back #SWC-66
11mm; not quite 1/2" diameter, shank hole size 2.5mm. Stylized flowers and paisleys, dimensional button. Matte silver and black. Petals are rounded and the button is flat, not domed.
This is the small size; we also have this one larger - see #SWC-20