This is a great old porthole-style mirror, made in six pieces, wonderfully jointed where they meet. I've found a few others somewhat like it dating to around the beginning of the 20th century, which seems a bit right, though perhaps it is a little older than that. The wood has a terrific patina and I think the dings here and there just add to its rich character. Really sweet.
Near the bottom, the corners of the mirror peek through two small gaps in the wood from where it is framed in the back--minor, and revealing of the construction. A few nails and some tape hold the mirror in place, and a bit more of the same might be helpful to make it extra secure. Otherwise, perfectly aged and worn. It would also be easy to remove the mirror and use as a picture frame. 10 5/8" wide x 12 5/8" tall x 7/8" deep.