Sorcerer's mirrors, also known as witch's mirrors or
bullseye mirrors, are convex mirrors with a history dating back to the 16th century. They became more popular in the 19th century, particularly during the Victorian era, when there was a greater interest in the occult and ornamental design. These mirrors were believed to have magical powers.
9 in wide. Glass ball feet make it 1.5 in tall. This one was likely a lamp base, it has the hole in the center. Perfect for use with a crystal ball or bowl.