Slightly domed concho style button with flower petals and circles around the edge. Very consistent button to button, 7/8" diameter or a bit larger. Shank opening is 2mm, and total thickness is around 3/16".   Imported. This is the darker, more charcoal gray, older-looking silver color. It has barely any shine. 

We also have a lighter silver version, and a slightly smaller version, in other listings. Type "Circles Around Flower" in the Search bar to see them all.