20 Brass Porthole Mirror. This one has a polished brass finish that ensures its place in any nautical decor style. This porthole adds sophistication, style, and charm for those looking to enhance rooms with a nautical theme. This porthole has a sturdy, heavy and authentic appearance. It is also made of brass just as most of the original portholes were. Hidden holes allow for easy mounting. It opens & closes and is fully functional. Made From Solid Brass & Glass. Superb Detail & Craftsmanship. Working Porthole Opens & Closes. Hidden holes for mounting.