Rado Watch True Square Open Heart R27073702. At Rado, we made our name producing square high tech ceramic watches. The Rado watches True Square is a new take on an iconic Rado shape. Our first watch made using a square injected monobloc high tech ceramic case, the True Square is light, scratch resistant and comfortable to wear. Distinctive and design led the Rado True Square Automatic Open Heart is the shape of things to come.