Here in the store, we refer to this type of single-post pull as a floret. It looks like a ring attached to a flower vase or bouquet. The back plate resembles a flower vase with a fanned out top. The ring pull also has a pattern. The pull appears to be nickel-plated brass.
The back plate measures 1 5/8 inches vertically and one inch across the top. There is a small hole at the bottom of the floret for securing the pull with a brad or small screw. The ring measures 1 7/8 inches across and 1 1/2 inches vertically. The total drop of the pull from top to bottom of the ring is 2 1/8 inches.
The post on the back inserts into the wood 3/8 inch. A screw is then fed from the back of the drawer and threaded into the post. The screw will be provided.