The image shows an antique door knocker hanging on a white wall in a museum. The knocker is made of metal and has a circular shape with a handle in the center. The handle is shaped like a lion's head and is attached to the wall with a hook. Below the handle, there is a small piece of metal, which appears to be a key or a keychain. On the right side of the image, there are two small white boards with information about the knocker. The background is blurred, but it seems to be an indoor space with other artifacts visible.